(D) The reaction described is the $Wolff-Kishner$ reduction. In the first step,the carbonyl compound reacts with hydrazine $(H_2NNH_2)$ to form a hydr

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(D) The reaction described is the $Wolff-Kishner$ reduction. In the first step,the carbonyl compound reacts with hydrazine $(H_2NNH_2)$ to form a hydrazone intermediate. The reaction is: $R_2C=O + H_2NNH_2 \rightarrow R_2C=N-NH_2 + H_2O$. Thus,the first intermediate formed is a hydrazone,$R_2C=N-NH_2$.