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What is the correct IUPAC name of the compound C6H5-CH=CH-COOH?

1. Cinnamic acid
2. 1-Phenyl-2-carboxyethane
3. 3-Phenylprop-2-enoic acid
4. Dihydroxy-3-phenylpropionic acid

Correct answer: 3-Phenylprop-2-enoic acid

Solution

The compound is a 3-carbon alpha,beta-unsaturated carboxylic acid. The IUPAC name is 3-phenylprop-2-enoic acid: prop-2-enoic acid (3-carbon chain with C=C at position 2, COOH at C1) with a phenyl group at C3.

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