Explain why ketones are less reactive towards nucleophilic addition reactions than aldehydes.

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Ketones are less reactive due to following reasons

(i) +I effect : The alkyl group in ketones due to their e releasing character decreases the electrophilicity or + ve charge on c-atom and thus reduces its reactivity.

(ii) Steric hindrance: Due to steric hindrance in ketones, they are less reactive.

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