Which of the following is not a fatty acid? Propanoic acid b. Acetic acid c. Phthalic acid d. Butanoic acid

Propanoic acid

Acetic acid

Phthalic acid

Butanoic acid

A fatty acid is a carboxylic acid with a long aliphatic chain.

Phthalic acid has a benzene ring structure, which is not characteristic of fatty acids