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(D) The reaction of a carbonyl compound (cyclopentanone) with hydrazine $(H_2N-NH_2)$ in the presence of an acid catalyst $(H^+)$ is a classic example

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Nucleophilic addition-elimination mechanism

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(D) The reaction of a carbonyl compound (cyclopentanone) with hydrazine $(H_2N-NH_2)$ in the presence of an acid catalyst $(H^+)$ is a classic example of nucleophilic addition followed by elimination of a water molecule.$1$. The nucleophilic nitrogen atom of hydrazine attacks the electrophilic carbonyl carbon of the ketone.$2$. This is followed by proton transfer and the elimination of a water molecule $(H_2O)$ to form a hydrazone.$3$. Therefore,the overall mechanism is classified as a nucleophilic addition-elimination reaction.

The reaction shown in the image proceeds via which mechanism?

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