A) hydrazine
B) phenyl hydrazine
C) semicarbazide
D) hydrogen cyanide
Correct Answer: D
Solution :
With hydrogen cyanide, carbonyl compounds give nucleophilic addition reaction while with hydrazine, phenyl hydrazine and semicar- bazide, they give addition-elimination reaction.
\[(Y=H,\,{{C}_{6}}{{H}_{5}},\,{{C}_{6}}{{H}_{5}}CO)\]
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