Chemistry - Nomenclature Question with Solution | TestHub

Question Explanation:

Determine the correct IUPAC name of the given unsaturated carboxylic acid.

Concept:

IUPAC nomenclature—longest carbon chain selection, functional-group priority, and correct numbering of substituents and double bonds.

Solution: Carboxylic acid is the principal functional group in this molecule.

The parent chain contains four carbons, with the carboxyl carbon of acid assigned as C-1. An ethyl substituent is located at C-2, and the carbon–carbon double bond begins at C-2.

IUPAC name: 2-Ethylbut-2-en-1-oic acid 

Final Answer: Option (C)