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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 acidI 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

Answer»

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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