Question

The IUPAC name of $C_6{H}_5-CH=CH-COOH$ is:

• A. cinnamic acid
• B. 1-phenyl-2-carboxyethane
• C. 3-phenyl prop-2-enoic acid
• D. dihydroxy-3-phenyl propionic acid

Answer 1

Answer: (C)

3-phenyl prop-2-enoic acid

The IUPAC name of the compound $C_6{H}_5-CH=CH-COOH$ is 3-phenyl prop-2-enoic acid.

The parent compound is a carboxylic acid with three carbon atoms. It contains a carbon-carbon double bond between the second and third carbon atom. It is called prop-2-enoic acid

A phenyl group is present as a substituent at a third carbon atom.
Its common name is 3-phenyl prop-2-enoic acid.

So, the correct option is $C$