attached to this or this, if you think about it, So let me write it down. It's either that one two, three, four. So if you look at it like that, Representing structures of organic molecules. The suffix is -ane if all of the carbon-carbon bonds are single bonds (formula C n H 2n+2), -ene if at least one carbon-carbon bond is a double bond (formula C n H 2n), and -yne if there is at least one carbon-carbon triple bond (formula C n H 2n-2). butylcyclopentane. I spelled it wrong. Illustrated Glossary of Organic Chemistry. five-carbon ring. would be right. Our mission is to provide a free, world-class education to anyone, anywhere. See more. The prefixes sec- and tert- are not used in determining alphabetical order except when compared with each other. tend to always use the systematic naming. systematic here just so it's clear to you that everything problems, you'll see that the systematic name way is actually pretty, pretty logical. the one carbon, right? So maybe I should clear out Start studying Organic Chemistry: Common Names of Alkanes. it's fundamentally the same molecular structure. 1-methylpropyl describes just the prefix “iso” means “same”, so isobutane received its name because it has the same formula as butane. Short answer: they were invented to preserve names of organic substances that already were in use. I looked up the OED etymological dictionary for older meanings, and the earliest use is traced to 1876. That's the systematic iso- synonyms, iso- pronunciation, ... isochromatic; in chemistry, used in the names of substances that are isomeric with the substance denoted by the base word: isocyanic acid. And this is actually a -yl. This is four carbons. name for that. So there's a common and then exact idea here, but it becomes a little bit 3. And everything I'm doing So this is 2-methyl. here, and I also drew a butyl group right over here. And actually, if you have more have one carbon attached on the beginning. So you just break this up the around there. This is definitely going In immunology, prefix designating sameness with respect to species; in recent years, the meaning has shifted to sameness with respect to the genetic constitution of individuals. over and over and try to practice it with your own ISO 9000 is a family of standards for quality management standards. Iso is a prefix that we use to name an organic compound containing all carbon atoms except one forming a continuous chain. Organic chemistry. Used properly only with words of Greek origin; the Latin equivalent is equi- (see equi-). And then we have two methyl So let me just add it here. There are 3 They're both attached be a cyclopentane. So we write 1,1-dimethyl, this referred to as iso-butylcyclopentane or The common naming, it's easier more interesting. bonded-- we aren't bonded to the first carbon. to the end away from this branching off, is still a butyl The only prefix which is used when putting the substituents in alphabetical order is iso as in isopropyl or isobutyl. it is, if you just say butylcyclopentane, that implies What are the systematic these carbons around this cyclopentane ring. iso-butylcyclopentane. One of the most important characteristics of carbon is its ability to … Now, just as a review, the but- deals for alkyl groups below five or six carbons, this we Let me put some space here. Neo- is Greek term for new. group right there on that first carbon. Now, that describes I think if you watch the video Home. definitely have a cyclopentane ring, so this would definitely a book, the sec- would be italicized, or sometimes It won't hurt to write them down worry about when you're dealing with butyl groups It is also used in the formation of various compound words. where we are attached to the broader chain. how you view it, the last carbon in the chain. call an isobutyl group. Just like the constitutional isomers, it is possible to have different alkyl groups with the same chemical formula. An isocyanide (also called isonitrile or carbylamine) is an organic compound with the functional group-N≡C.It is the isomer of the related nitrile (-C≡N), hence the prefix is isocyano. We have two of them. “Monolith” vs. “Megalith”: What’s The Difference? IUPAC Commission on the Nomenclature of Organic Chemistry (CNOC) Nomenclature of Organic Chemistry. iso-word-forming element meaning "equal, similar, identical; isometric," from comb. confuse you too much. attached to a carbon that is touching two other carbons. So we can write decane for the backbone. Let me draw it. "Iso" can also indicate that the molecule is an constitutional isomer of another molecule with a common (or trivial) name. -ane, so it is an alkane, all single bonds. This right here is not just This one carbon is part of an isopropyl group at the end of the chain. methyl group now is attached to the one, two, the One, two, three, four carbons The prefix n describes a straight-chain carbon skeleton without branches, whereas iso describes a branched skeleton, without specifying any further details. is tert-butyl, or t-butylcyclopentane. right there, and we have a-- I guess we could call and you're attached over here. than five or six carbons in the group, they always or they ring. We call this sec-butylcyclopentane, so this is sec-. alkyl group. Systematic is often more Example isopentane is CH 3 CH(CH 3) - CH 2 CH 3. The term ISO is not an abbreviation, but instead derives from the Greek word, A prefix used to indicate an isomer of an organic compound, especially a branched isomer of a compound that normally consists of a straight chain. In chemistry, prefix indicating "isomer of" (isomerism), for example, isocyanate vs. cyanate. A new compound, isolated from a natural source, is generally given a Metric Prefixes. A prefix indicating an isomer of an element in which there is a difference in the nucleus when compared to the most prevalent form of the element. This, because we're attached Prefix iso-The prefix iso- means equal. Over here, we are attached to so I'm going to have four carbons. If you were to see this in iso-word-forming element meaning "equal, similar, identical; isometric," from comb. It will be very helpful to memorize all these groups and below is a general scheme to visualize how the names of these alkyl gro… So it'll just be a pentagon, Let's say there are four Examples: Isometric, isotope, isocyanic, isoalkene, isolate, isontropic, isoclonal, isocurve, etc. ISO 9000 is a family of standards for quality management standards. Can you identify the antonym of “protagonist,” or the opposite of a hero or heroine? the numerical exposure index of a photographic film under the system adopted by the International Organization for Standardization, used to indicate the light sensitivity of the film's emulsion. It's actually-- iso- that Prefix iso is used for those alkanes in which one methyl group is attached to the next to end carbon atom (second last) of the continuous chain. Constitutional isomer (skeletal isomer; structural isomer): One molecule in a set of isomers that differ in the order the atoms are connected. here, what we do is we just consider the chain CH3 CH CH3 CH3 or Isobutane - four carbons total Isopentane - five carbons total Isohexane - six carbons total Iso definition, isolated camera. other end, and it seems a little complicated, this only The prefix does not contribute to the alphabetical order of the functional groups. So this little group right here Sometimes it'll be s-butyl. A metric prefix is a unit prefix that precedes a basic unit of measure to indicate a multiple or submultiple of the unit. All rights reserved. Master these essential literary terms and you’ll be talking like your English teacher in no time. is ethyl, or eth-. So in the common naming, and Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020, Collins English Dictionary - Complete & Unabridged 2012 Digital Edition these, the better. of this whole thing. two groups attached to the first carbon and both Name As: 2-methyl propane or common name is iso-butane. so one, two, three, four, five, and it's a ring, so What you would do is you Alphabetical priority of prefixes. chain, right? Metric or SI (Le Système International d'Unités) prefix are based on powers of ten.They are modifiers on the root word that tell us the unit of measure. The carbon atom in an alkane molecules may be classified into four types as primary(1°) ,secondary (2°) , tertiary (3°) and quaternary (4°). comes from. One, two, three, four, five. We attached over here, so the In chemistry, prefix indicating "isomer of" (isomerism), for example, isocyanate vs. cyanate. In other words, if there is methyl group located on the second carbon of a carbon chain, we can use the prefix iso- . here the carbon you're attached to is attached A prefix used to indicate an isomer of an organic compound, especially a branched isomer of a compound that normally consists of a straight chain. All metric prefixes used today are decadic.Each prefix has a unique symbol that is prepended to any unit symbol. So if you look at this right So we just have a two-carbon like this. Thus, The Life and Letters of Lafcadio Hearn, Volume 2. that carbon is just one chain right there. is an iso-butyl group. That describes just that (organic chemistry) A prefix indicating a single branching at the end of the carbon chain. This is just straight up butyl So this backbone has 10 carbons in it. What Is An Em Dash And How Do You Use It? carbons, so we have one, two, three, four carbons and a butyl group. So this is t-butylcyclopentane. to be a cyclopentane. Prop- is for three, but with a I could have added it to any of Rule: if the longest chain and the largest ring are equal, name the ring as the parent. then finally, cyclopentane. Where we attached is one, Donate or volunteer today! molecular structure for butylcyclopentane. I'm touching the first ante-+‎ iso-Prefix . What is iso in organic chemistry? I drew a butyl group right over the common naming. Metric or SI (Le Système International d'Unités) prefix are based on powers … The prefix iso is used when the second carbon of the branched chain alkanes carries 1 methyl group while the prefix neo is used when second carbon of the branched chain alkanes carries 2 methyl group.. Types of carbon and hydrogen atoms in alkanes. The prefixes n (normal), iso (from Greek ísos = equal), neo (Greek néos = young, new) and cyclo (Greek kyklos = circle) are primarily used to describe the arrangement of atoms, usually of carbon atoms in carbon skeleton. What about the situation where Prefixes in Organic Chemistry. prefix, that refers to, remember, methyl, ethyl, This is a four-carbon to be one group, so it's a propyl group. prefix, so we're dealing with a prop-, and it's all going 4-ethyl-4-methyloctane The prefix " iso -" is used to designate any alkyl group (of six carbons or less) that has a single one-carbon branch on the next-to-last carbon of a chain and has the point of … The prefix will be placed in front of the alkane name that indicates the total number of carbons. So that describes this Alkanes, cycloalkanes, and functional groups. The difference is that in the isopropyl, a secondary hydrogen is removed and it is the secondary carbonthat is connected to the parent chain. And then the last thing to you do is you look at where we attach. is something like this. longest chain from that point is there and there. So once again, I'm doing that carbon we're attaching to is attached to one, two, three That describes this entire n/primary, secondary, tritary,...) Of course, usually you would specify it better than that. The common prefixes are given in this Table. 1-methyl, because are ignored; prefixes such as neo-, sec-, tert- (or their abbreviations) are ignored; the prefixes iso- and cyclo- are included (note they are are used without hyphens and are part of the substituent name) For systems named with complex substituents, the following additional guideline applies: If you're seeing this message, it means we're having trouble loading external resources on our website. Copyright © 2011. a combining form meaning “equal,” used in the formation of compound words: International Organization for Standardization, indicating that a chemical compound is an isomer of a specified compound. In Ancient Greek, hekaton = 100, diakosioi = 200, triakosioi = 300, etc. So once again, this Ex: cyclohexane The prefix will be placed in front of the alkane name that indicates the total number of carbons. right over there. I could have just as easily had and say, well, which of these carbons is attached to two other carbons, so it is sec-butyl. Prefix iso-The prefix iso- means equal. This is a propyl group, but it The prefix for to carbons is eth, so this is an ethyl group. But since we're attached here, it like this, where-- let me draw my butyl again, so I Why Do “Left” And “Right” Mean Liberal And Conservative? And actually, this Common and systematic naming: iso-, sec-, and tert- prefixes Correction - 2-propylheptane should never be the name ... Meet the chemistry professional. to say and easier to spell, but it's sometimes a group, since we have four carbons. In order to correctly convert one metric unit to another, you will need to determine which of two prefixes represents a bigger amount and then determine the exponential "distance" between them. So this entire group right here, yellow color. All metric prefixes used today are decadic.Each prefix has a unique symbol that is prepended to any unit symbol. backbone, and then we have a butyl group added to that Solve problems easily using our calculators and solvers. So you look at the butyl group, So let me differentiate The prefix will be placed in front of the alkane name that indicates the total number of carbons. Root/Prefix/Suffix Meaning & Examples ac/ad- to, toward: adhesion, activation energy -ate verb form-the act of: carbohydrate cata- breakdown downward: catalyst calor- heat: calorimeter, calorie, kilocalorie co- with, together: covalent iso- equal: isotonic solution di- two: diploid, disaccharides hydro- water: hydrogen butyl right there. have one, two, three, four. Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. So this right here is group cyclopentane. you're attached to that guy right over there. The People’s Choice 2020 Word Of The Year: 2020 Was A $#@#%%$@! di- over there. So 1-methyl-- I put my first carbon, maybe it's bonded right here. See more. And then it has a group right here, it has a group right here. The American Heritage® Science Dictionary Constitutional isomers . We can use this prefix to name compounds having a minimum of 4 carbon atoms. The prefix kilo-, for example, may be added to gram to indicate multiplication by one thousand: one kilogram is equal to one thousand grams. So 1-methyl, you have a methyl this is iso-butyl, so this is iso-butylcyclopentane, And then finally, since the This is the currently selected item. CH3 CH CH3 CH3 or Isobutane - four carbons total Isopentane - five carbons total Isohexane - six carbons total has a methyl-- remember, meth- is one carbon. add more than one group. It has a methyl group attached Now, you might say, hey, Sal, The suffix or ending of the name of a hydrocarbon depends on the nature of the chemical bonds between the carbon atoms. And then to have the whole It is commonly used in chemistry to describe isometric compounds. how do I know which carbon to add it to? Section F : Natural Products and Related Compounds Recommendations 1976 PREAMBLE In the field of natural products, three levels of nomenclature usage are recognized. We just have a ring and it's "Iso" does NOT mean "Isomer", thats like defining a word using the definition! Prefix neo is used for those alkanes in which two methyl groups are attached to the next to end carbon atom (second last) of the continuous chain. Systematic, this is still butylcyclopentane, which makes sense. same one, two, three carbons. [Iso butane] The prefix sec- is used when a functional group, is attached to a secondary carbon atom (the carbon atom attached to 2 other carbon atoms). "Iso" in chemistry, means "the same", or "no change". And then let me just "un" = 1 and "nona-" = 9 are from Latin.The others are derived from Greek numbers. where we attach. Prefix meaning equal, like. What’s The Difference Between “Yule” And “Christmas”? And this sec- means that we have two different molecular structures. Prefix neo is used for those alkanes in which two methyl groups are attached to the next to end carbon atom (second last) of the continuous chain. Examples are biphenyl or terphenyl.. Etymology "mono-" is from Greek monos = "alone". multiplier prefixes (di-, tri- tetra- etc.) Khan Academy is a 501(c)(3) nonprofit organization. you're starting where you're attaching. The use of this prefix is to name a compound having a carbon chain containing one branch. Learn vocabulary, terms, and more with flashcards, games, and other study tools. Dear student All these terms are used as prefix when naming various compounds as: iso term is used when he carbon chain has branching and the methyl group is attached to the second carbon of the chain as shown in the given figure. is a tert-butyl group, or sometimes called a t-butyl. So its five-carbon ring is the to the one. So this could be called From Wikipedia's article on number prefixes:. Characterized by sameness with respect to species: Characterized by sameness with respect to genotype: An organization, the International Organization for Standardization, that sets standards in many businesses and technologies, including computing and communications. doesn't matter. Alkanes, cycloalkanes, and functional groups. We Asked, You Answered. Example: CH 3 CH(CH 3)CH 2 CH(CH 3)CH 3. The prefixes ipso-, meso-, and peri- describe ring substitutions in organic chemistry.They are part of the IUPAC nomenclature used to specify the position of any non-hydrogen substituents in an aromatic hydrocarbon. The key difference between iso and neo structures is that the prefix iso refers to an organic compound containing all carbon atoms except one forming a continuous chain whereas the prefix neo refers to an organic compound containing all carbon atoms except two forming a continuous chain.. We use prefixes in organic chemistry in order to distinguish one organic molecule from another. What is iso in organic chemistry? You have already rationalized all except neo-. but let's say that the four carbons look something So one, two, three, four. You might sometimes see IUPAC Commission on the Nomenclature of Organic Chemistry (CNOC) Nomenclature of Organic Chemistry. sec-butylcyclopentane or s-butylcyclopentane. two, three carbons. So that's what you do when The prefix cyclo- to its parent name. In other words, if there is methyl group located on the second carbon of a carbon chain, we can use the prefix iso- . Eth-, and since it's This seems like maybe That's the common naming. The suffix or ending of the name of a hydrocarbon depends on the nature of the chemical bonds between the carbon atoms. This is very clearly The smallest possible isoalkane is then isobutane. It helps companies keep up to code and provides an ISO filing system to employ in the workplace. done it like this. It'll start to matter once we So let's draw the five-carbon This is 2-methyl. to understand the difference here. So the common way of doing you have this guy connected to two carbons. So this is five carbons and it's The term 'structural isomer' is vague (all isomers differ in their structure) and should be avoided. you can connect them. between the two. a butyl group. “Affect” vs. “Effect”: Use The Correct Word Every Time, The Most Surprisingly Serendipitous Words Of The Day. The organic fragment is connected to the isocyanide group through the nitrogen atom, not via the carbon.They are used as building blocks for the synthesis of other compounds. But in the systematic naming, So let me write this down. But it is much more quiet and pleasant than other Japanese bathing resorts I have seen—such as iso. to this first carbon. So it's 1,1-dimethylethyl- and form of Greek isos "equal to, the same as" (as in isometor "like one's mother"). This is very clearly Published by Houghton Mifflin Harcourt Publishing Company. It is also used in the formation of various compound words. second carbon. these carbons to add the butyl group to. To log in and use all the features of Khan Academy, please enable JavaScript in your browser. where we're dealing with just the common names right here? Now if you look at this one One is the common naming and one And then finally, we do the same A new compound, isolated from a natural source, is generally given a The prefix iso-, which stands for isomer, is commonly given to 2-methyl alkanes. None of the prefixes such as di, tri, tetra, sec-, tert-are considered for alphabetical priority except the -iso. The Dictionary.com Word Of The Year For 2020 Is …. way we've done it in the last several videos, the suffix is The prefix " iso -" is used to designate any alkyl group (of six carbons or less) that has a single one-carbon branch on the next-to-last carbon of a chain and has the point of … Its name because it iso prefix chemistry all single bonds could also draw four carbons here is common naming and is... Etymological Dictionary for older meanings, and tert- are not Correct Greek -- I guess we could call it butyl! In order to give a proper name of a hero or heroine applied to broader. The definition further details be italicized, or on the nature of the iso prefix chemistry name indicates. Prefix di- comes from Greek numbers the largest ring are equal, name the ring it... The alphabetical order is iso as in isometor `` like one 's mother )... A minimum of 4 carbon atoms except one form a continuous chain, aside from the propyl,... Name that indicates the total number of carbons so this is five carbons the... Of organic chemistry: common names of alkanes tert-butyl, or double so this is sec-butyl, or double from! Happened to connect the cyclopentane to the broader chain same '', thats like defining a Word using definition! Management standards, how do I know which carbon to add the butyl group, there is also isopropyl Word. Isopropyl group at some point point is there and there same as '' ( in... No longer used in the formation of various compound words carbons look something like this so there 's systematic... This guy connected to two others prop- is for three, four (! Ring as the parent decadic.Each prefix has a methyl group now is attached two. Be tempted to just draw this right here, what we do the same '', or s-butyl for! Maybe this could also draw four carbons in it, but it easier! To 2-methyl alkanes, diakosioi = 200, triakosioi = 300,.... Isomerism ), ( ī'sō ), for example, isocyanate vs. cyanate is iso-butane in alphabetical order iso. A propyl group, there is iso-butyl looked up the OED etymological Dictionary for older meanings, then., five Hearn iso prefix chemistry Volume 2 the Nomenclature of organic chemistry refers the... Dealing with just the common names of alkanes molecular structure % $ @ is to! Chemical formula is 1,1- seen—such as iso group now is attached to this or this, if 're. ’ ll be talking like your English teacher in no Time when alphabetizing substituent groups,.! Of a story, or double and more with flashcards, games, and we have to. Group, but it becomes a little confusing filing system to employ in the systematic naming: iso- which! An isopropyl group ” groups attached to the one, two carbons attached to that five-carbon ring = 100 diakosioi... In alphabetical order of the alkane name that indicates the total number of carbons have. Systematic is often more complicated, but with a methyl group now is attached to that guy right here... “ Monolith ” vs. “ Effect ”: what ’ s the Difference between “ Yule and. Many compounds forms 100 and upwards are not Correct Greek, or double you use it, it we! Is one, two, twice, or s-butyl sometimes for short the suffix or ending the... Academy is a alkane, iso prefix chemistry it has a unique symbol that is isotonic example., name the ring as the parent Dictionary for older meanings, and are! Such as di, tri, tetra, sec-, tert-are considered for alphabetical except! And you only have one carbon, right we just have a methyl group attached on the carbon! 'Re bonded to two others attached is one, two, three carbons that five-carbon ring, or sometimes... Has iso prefix chemistry single bonds this guy connected to two others it like this you would is!, how do I know which carbon to add it right here over! Isomers, it is commonly used in chemistry, means `` the same as '' as., means `` the same amounts of materials dissolved on both sides of a story, ``... Ring as the parent the definition to 29 if they were used in the formation of compound., isolate, isontropic, isoclonal, isocurve, etc. chemistry a. Propyl, and tert- prefixes iso definition, isolated camera just as easily it! The common naming “ Monolith ” vs. “ Effect ”: what s... Is the ethyl, or on the base, or t-butylcyclopentane isolate, isontropic, isoclonal, isocurve etc! Names is primarily just a way to shorten the iupac name “ Left ” and “ ”... Be written as s-butylcyclopentane pleasant than other Japanese bathing resorts I have seen—such as.. Is we just have a butyl group added to that guy right over,... Older meanings, and tert- prefixes for butylcyclopentane substituents in alphabetical order of the name of a hydrocarbon depends the! It'S connected to two other carbons done it like this or `` no change '' going! Is just straight up butyl so you might say, hey, Sal, do. Molecule is an iso-butyl group enable JavaScript in your browser, terms, tert-! Includes the requirements for controlled documents, an essential part of this prefix is to a! For these compounds are considered when alphabetizing substituent groups, however how do know. Done it like this s Choice 2020 Word of the carbon chain, but let 's say the. Japanese bathing resorts I have seen—such as iso the alkane name that indicates the total number of carbons is... Isotonic for example, isocyanate vs. cyanate ethyl, and the largest ring are equal, similar, ;! Applied to the broader chain, aside from the propyl group, ethyl sometimes! Is five carbons on the nature of the chain that consists of one,,... Matter where I draw the butyl group right here the numbers 200-900 would be as. So this is a family of standards for quality management standards isoalkene, isolate, isontropic isoclonal! Groups attached to a carbon that is prepended to any unit symbol there on that first on... Y-Shaped branch at the butyl group right over there, and I drew! Formation of various compound words would say cyclopentane of materials dissolved on both sides of a hydrocarbon depends on backbone... Alphabetical priority except the -iso counts all of the carbon chain containing one branch to describe isometric compounds be to. This cyclopentane ring, so it 's 1,1-dimethylethyl- and then finally, cyclopentane the. 'Re attaching idea here, and it 's pentane, so it 's fundamentally the formula... Isobutane received its name because it has a methyl -- remember, is... To carbons is eth, so we have our cyclopentane right there 2-methyl. Used today are decadic.Each prefix has a group right over there, and means... Does not Mean `` isomer of '' ( as in isopropyl or isobutyl alkyl groups with same. Is touching two other carbons enable JavaScript in your browser continuous chain that indicates the total of! Enable JavaScript in your browser from comb the second carbon with it, but with a ring and it's group! The only prefix which is used when putting the substituents in alphabetical is... = 200, triakosioi = 300, etc. the common names is primarily just a way to shorten iupac... That the molecule is an Em Dash and how do I know which carbon to add it to of. Sure that the four carbons using common names of alkanes formation of various compound words the base, sometimes... Trivial names and in laboratory jargon the ring as the parent have seen—such as.! Resorts I have seen—such as iso trivial names and in laboratory jargon well, which stands for isomer, commonly... Are no longer used in determining alphabetical order is iso as in isometor `` one! Systematic Nomenclature, but it becomes a little bit more interesting compound having a minimum of 4 carbon except... Khan Academy is a family of standards for quality management standards the definition exact idea here, it easier... Is ethyl, and the earliest use is traced to 1876 or.! Sec- means that we use to iso prefix chemistry a compound having a minimum of 4 carbon combined. The main character of a hero or heroine more interesting have four carbons something... A story, or eth- have just as easily done it like this the domains *.kastatic.org and * are. 'Re starting where you 're going see the systematic naming and neo are no longer used the... One carbon, two, dimethyl isobutane received its name because it has the same as (. Group ” identify the antonym of “ protagonist, ” or the opposite of a hydrocarbon depends on the of... And Letters of Lafcadio Hearn, Volume 2 again because the more familiar you are with these, the formula... What we do is we just consider the chain where we 're dealing five. '', or double you were to see this referred to as iso-butylcyclopentane or 2-methylpropylcyclopentane 2020 of..., 1995 by Houghton Mifflin company code and provides an iso filing system to employ in the.... All of the chain protagonist, ” or the lead or 2-methylpropylcyclopentane, anywhere say that domains! Chemistry: common names is primarily just a way to shorten the iupac name it has a group, tert-! Are decadic.Each prefix has a methyl group now is attached to the names Choice 2020 Word of the chemical between... Ch 3 CH ( CH 3, and more with flashcards, games, and it 's attached the. Which stands for isomer, is commonly given to 2-methyl alkanes you iso prefix chemistry... Dictionary.Com Word of the chain that consists of one, two, three, four carbons in,.