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Q. Compare the aldehydes or ketones, is more reactive towards nucleophilic addition reactions and why?

Q. Compare the aldehydes or ketones, is more reactive towards nucleophilic addition reactions and why?

Grade:Upto college level

1 Answers

Sunil Kumar FP
askIITians Faculty 183 Points
6 years ago

Aldehydes are usually more reactive toward nucleophilic substitutions than ketones because of both steric and electronic effects. In aldehydes, the relatively small hydrogen atom is attached to one side of the carbonyl group, while a larger R group is affixed to the other side. In ketones, however, R groups are attached to both sides of the carbonyl group. Thus, steric hindrance is less in aldehydes than in ketones.Electronically, aldehydes have only one R group to supply electrons toward the partially positive carbonyl carbon, while ketones have two electron‐supplying groups attached to the carbonyl carbon. The greater amount of electrons being supplied to the carbonyl carbon, the less the partial positive charge on this atom and the weaker it will become as a nucleus

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