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(B) Nucleophilic addition reactions are generally more favored in aldehydes than in ketones due to both steric and electronic factors.Sterically,the p

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$CH_3-CHO$

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(B) Nucleophilic addition reactions are generally more favored in aldehydes than in ketones due to both steric and electronic factors.Sterically,the presence of two relatively large substituents in ketones hinders the approach of a nucleophile to the carbonyl carbon.Electronically,two alkyl groups reduce the electrophilicity of the carbonyl carbon more effectively than in aldehydes due to their $+I$ effect.Among the given options,$CH_3-CHO$ (ethanal) has the smallest alkyl group compared to propanal and the ketones,making it the most reactive towards nucleophilic addition.

Nucleophilic addition reaction will be most favoured in:

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