Textbook Question
Name the following carboxylic acids (when possible, give both a common name and a systematic name).
(d)
(e)
(f)
22. Carboxylic Acid Derivatives: NAS
Naming Carboxylic Acids
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Provide the IUPAC name for the following compound.
A
1-methylhexanoic acid
B
2-hexanoic acid
C
6-heptanoic acid
D
2-ethylpentanoic acid
Verified step by step guidance1
Identify the longest carbon chain that includes the carboxylic acid group (CO2H). In this structure, the longest chain is five carbons long, which is a pentanoic acid.
Number the carbon chain starting from the carboxylic acid group, which is the highest priority functional group. This means the carboxylic acid carbon is carbon 1.
Identify and name the substituents attached to the main carbon chain. In this case, there is an ethyl group (CH2CH3) attached to the second carbon of the main chain.
Combine the names of the substituents with the main chain name. The substituent ethyl is on the second carbon, so it is named as 2-ethyl.
Combine the substituent name with the main chain name to form the complete IUPAC name: 2-ethylpentanoic acid.
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