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Polarity of Carbonyl Group

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Estimated time: 2 minutes
Maharashtra State Board: Class 12

Key Points: Polarity of Carbonyl Group

  • In the carbonyl group, the π-electron cloud is displaced towards the more electronegative oxygen, making carbon partially positive (δ+) and oxygen partially negative (δ−).
  • The polarity of the carbonyl group is also explained by resonance, with electron delocalisation shown through two principal resonance forms.
  • Aldehydes are more reactive than ketones towards nucleophilic attack due to two factors: electronic effect and steric effect.
  • Electronic effect: Aldehydes have only one electron-donating group (EDG) attached to the carbonyl carbon, making them more electrophilic than ketones.
  • Steric effect: Aldehydes have less steric hindrance than ketones, so nucleophiles can attach more easily; note that aromatic aldehydes are less reactive than aliphatic aldehydes in nucleophilic addition reactions.
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