question_answer

Which of the following dicarboxylic acids gives  a cyclic anhydride on heating?

A)  \[HOO{{(C{{H}_{2}})}_{2}}COOH\]          

B)  \[C{{H}_{2}}{{\left( COOH \right)}_{2}}\]

C)  \[HOOC{{\left( C{{H}_{2}} \right)}_{4}}COOH\]

D)  \[HOOC{{\left( C{{H}_{2}} \right)}_{5}}COOH\]

Correct Answer: A

Solution :

                 Dicarboxylic acids with two or three intervening carbons, on heating alone at 573 K undergo dehydration to form anhydrides.