question_answer

Which of the following acids is isomeric with phthalic acid

A)                 Succinic acid

B)                 Salicylic acid

C)                 1, 4-benzene dicarboxylic acid

D)                 Methyl benzoic

Correct Answer: C

Solution :

           Phthalic acid is the isomer of 1, 4 benzene dicarboxylic acid because both have the same molecular formula but differ in their structure.