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(A) Nucleophilic addition reactions are influenced by steric and electronic factors. Aldehydes are generally more reactive than ketones because they h

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$CH_3-CHO$

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(A) Nucleophilic addition reactions are influenced by steric and electronic factors. Aldehydes are generally more reactive than ketones because they have less steric hindrance and fewer electron-donating alkyl groups ($+I$ effect),which reduces the electrophilicity of the carbonyl carbon. Among the given options,$CH_3-CHO$ (ethanal) has the smallest alkyl group compared to $CH_3-CH_2-CHO$ (propanal),and it is an aldehyde,whereas the other options are ketones or larger aldehydes. Therefore,$CH_3-CHO$ is the most reactive toward nucleophilic attack.

Nucleophilic addition reaction will be most favoured in

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