Which class of compound is produced when benzaldehyde reacts with phenylhydrazine?

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Multiple Choice

Which class of compound is produced when benzaldehyde reacts with phenylhydrazine?

Carbonyl compounds react with hydrazine derivatives to form hydrazones via a condensation process. In this case, benzaldehyde (an aldehyde) reacts with phenylhydrazine to give the corresponding hydrazone, specifically a benzaldehyde phenylhydrazone, with the C=O group replaced by a C=N–NH–Ph linkage (Ph–CH=N–NH–Ph). The reaction involves nucleophilic attack by the hydrazine on the carbonyl carbon, formation of a carbinolamine-like intermediate, and loss of water to form the C=N bond. This is why the product is a hydrazone, not an alcohol, ketone, or amide.

Carbonyl compounds react with hydrazine derivatives to form hydrazones via a condensation process. In this case, benzaldehyde (an aldehyde) reacts with phenylhydrazine to give the corresponding hydrazone, specifically a benzaldehyde phenylhydrazone, with the C=O group replaced by a C=N–NH–Ph linkage (Ph–CH=N–NH–Ph). The reaction involves nucleophilic attack by the hydrazine on the carbonyl carbon, formation of a carbinolamine-like intermediate, and loss of water to form the C=N bond. This is why the product is a hydrazone, not an alcohol, ketone, or amide.

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