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What is the IUPAC name of (C6H5)CH2CH2COOH?

(a) 2-Phenylethanoic acid

(b) 2-Phenylpropanoic acid

(c) 3-Phenylethanoic acid

(d) 3-Phenylpropanoic acid

I had been asked this question in final exam.

My question comes from Nomenclature and Structure of Carboxyl Groups in chapter Aldehydes, Ketones and Carboxylic Acids of Chemistry – Class 12

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Correct option is (d) 3-Phenylpropanoic acid

Explanation: The compound has the group (-CH2CH2COOH) directly attached to a benzene ring. The preference is given to the carboxyl group and the compound is named as a carboxylic acid derivative. There are total three carbons making it propanoic acid with the benzene ring as substituent on the last carbon (C-3) as a phenyl group.

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