See image — AITS & Test Series Chemistry Question

💡 Solution & Explanation

H Cl H H Cl H KCN   NC CN 3 H O  HOOC COOH 2 H O    O O O (A) Succinic anhydride 3 H O KCN 3 2 3 2 3 2 3 2 decarboxylation (B) H C CHCl H C CH(CN) H C CH(COOH) CH CH COOH         