Which of the following does NOT react with acetic anhydride to give an acyl derivative?

A $(CH X_{3}) X_{3} N$
B $C X_{6} H X_{5} NH X_{2}$
C $(CH X_{3}) X_{2} NH$
D $CH X_{3} NH X_{2}$

Answer: A

Acylation requires an N-H hydrogen that can be replaced. Primary and secondary amines have it, so they give amides. A tertiary amine has no N-H and cannot form a stable amide.

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