What is the IUPAC name of the following compound? Select one:
a. 4-methyl-3-phenyl-3-pentenoic acid
b. (Z)-3-methyl-2-phenyl-2-butenoic acid
c. 3-phenyl-2-methyl-2-penten-5-oic acid
d. 4,4-dimethyl-3-phenyl-3-butenoic acid

The image of the structure is attached in the image below.

The correct option is a.) 4-methyl-3-phenyl-3-pentenoic acid

Explanation:

Carboxylic acids are a type of functional group in organic chemistry that have the symbol '-COOH'. A suffix used for this functional group is '-oic acid'.

To name a compound, first look for the longest possible carbon chain.

As in the image attached below, the longest carbon chain has 5 carbon atoms. Thus, the prefix used will be 'pent-'

Also, a methyl substituent is present at the 4th position, a phenyl substituent is located at the 3rd position.

A double bond is also present at the 3rd position and a suffix '-ene' is used.

Hence, the IUPAC name for the given compound is 4-methyl-3-phenyl-3-pentenoic acid.