Which of the following aldehydes is most reac | vedclass

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(C) The reactivity of carbonyl compounds towards nucleophilic addition reactions depends on the magnitude of the positive charge on the carbonyl carbo

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$HCHO$

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(C) The reactivity of carbonyl compounds towards nucleophilic addition reactions depends on the magnitude of the positive charge on the carbonyl carbon atom.Alkyl groups are electron-donating ($+I$ effect),which decreases the positive charge on the carbonyl carbon and reduces its reactivity.In $HCHO$ (formaldehyde),there are no alkyl groups attached to the carbonyl carbon.In $CH_3CHO$ (acetaldehyde),one methyl group is attached.In $C_6H_5CHO$ (benzaldehyde),the phenyl group provides resonance stabilization,further reducing the electrophilicity of the carbonyl carbon.Therefore,the order of reactivity is $HCHO > CH_3CHO > C_6H_5CHO$.Thus,$HCHO$ is the most reactive.

Which of the following aldehydes is most reactive $?$

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