Question

Which dicarboxylic acid in presence of a dehydrating agent is least reactive to give an anhydride :

• A.
• B.
• C.
• D.

Answer 1

Answer: (D)

Adipic acid $C{O}_{2}H-(C{H}_2{)}_4-C{O}_{2}H\underset{\text{agent}}{\overset{\text{dehydrating}}{\to }}$ 7 membered cyclic anhydride (Very unstable)