Answer:
Hydrazones are formed by reacting
carbonyl compounds with hydrazine \[(\overset{\centerdot \,\,\centerdot
}{\mathop{N}}\,{{H}_{2}}-\overset{\centerdot \,\,\centerdot }{\mathop{N}}\,{{H}_{2}})\]
which acts as a nucleophile. In the strongly acidic medium, hydrazine gets
protonated and, therefore, it is not in a position to act as nucleophile. As a result,
aldehydes and ketones are not prepared in strongly acidic medium. For more
details, consult section 13.8.
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