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Question
Out of p-tolualdehyde and p-nitrobenzaldehyde, which one is more reactive towards nucleophilic addition reactions, why?
Solution
P-nitrobenzaldehyde is more reactive towards the nucleophilic addition reaction than p- tolualdehyde as Nitro group is electron withdrawing in nature. Presence of nitro group decrease electron density, hence facilitates the attack of nucleophile. The presence of \[\ce{-CH3}\] leads to +I effect as \[\ce{-CH3}\] is electron releasing group.
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