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(B) The formation of cyanohydrin involves a nucleophilic addition reaction to the carbonyl group. The reactivity depends on the electrophilicity of th

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$p-$Nitrobenzaldehyde

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(B) The formation of cyanohydrin involves a nucleophilic addition reaction to the carbonyl group. The reactivity depends on the electrophilicity of the carbonyl carbon. Electron-withdrawing groups increase the partial positive charge on the carbonyl carbon,making it more susceptible to nucleophilic attack by the $CN^-$ ion. Among the given options,the $-NO_2$ group in $p-$nitrobenzaldehyde is a strong electron-withdrawing group,which significantly increases the electrophilicity of the carbonyl carbon compared to the other substituents. Therefore,$p-$nitrobenzaldehyde is the most reactive compound towards cyanohydrin formation.

The most reactive compound towards the formation of cyanohydrin on treatment with $KCN$ followed by acidification is:

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