emmalav
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Hi I was just wondering when you are naming an organic compounds do you always number the chain depending on the functional group and then the side chains and substituting groups after that. And i was also wondering how do you know what to put first the side chain prefix such as methly or the substituting group prefix such as chloro- etc. Is this just by alphabetical means thanks! Any help appreciated
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Puddles the Monkey
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(Original post by emmalav)
Hi I was just wondering when you are naming an organic compounds do you always number the chain depending on the functional group and then the side chains and substituting groups after that. And i was also wondering how do you know what to put first the side chain prefix such as methly or the substituting group prefix such as chloro- etc. Is this just by alphabetical means thanks! Any help appreciated
Hi there,

I'm not sure whether this should be in biology or chemistry to help you get more replies.

I'm going to hazard a guess at... chemistry.

Let me know if it needs moving again someone please! Thanks.
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charco
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(Original post by emmalav)
Hi I was just wondering when you are naming an organic compounds do you always number the chain depending on the functional group and then the side chains and substituting groups after that. And i was also wondering how do you know what to put first the side chain prefix such as methly or the substituting group prefix such as chloro- etc. Is this just by alphabetical means thanks! Any help appreciated
There is a very complicated hierarchy of rules as regarding functional groups and substituents that fill up hundreds of pages of the IUPAC website.

Suffice to say that at A level you usually number the carbon of a carboxylic group, amide or aldehyde as C#1.

Alkyl substituents are named alphabetically.

Halogens go before alkyl groups in the prefix.

etc ...
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Sycopation
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Longest chain is the parent chain. E.g in 2-methyl-butane, the longest possible chain is 4 carbons, i.e (But)ane

side groups then come off. If there are two or more alkyl groups coming off the longest chain, then you have to name the position of each side chain e.g 2,3 dimethyl-butane.

Same for halogenoalkanes

For side groups, it comes in alphabetical order
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