The anhydride shown is treated with an excess of ammonia. What is the nitrogen-containing organic product?

AStructure A
BStructure B
CStructure C
DStructure D

Answer: D

Ethanoic anhydride undergoes nucleophilic acyl substitution with ammonia: one acetyl group is transferred to nitrogen, forming ethanamide, and the other leaves as ethanoate. The amide is not reduced or dehydrated under these conditions.

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