What is (are) the missing reagent(s) in the reaction below?

Question

Quizplus · Accepted Answer

The reaction shown is a nucleophilic addition reaction with HCN (hydrogen cyanide) as the nucleophile. The missing reagents are NaCN (sodium cyanide) and NH₄Cl (N-hydroxysuccinimide chloride), which would likely be used to activate the carboxylic acid group and make it more reactive towards nucleophilic attack by the cyanide ion. Option A, NH₃, is not a known reagent. Option B, HCN, is already present in the reaction. Option D, NaNH₂, is not commonly used in this type of reaction.

What Is (Are) the Missing Reagent(s) in the Reaction Below