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Topic: Carbonyl group and nucleophilic addition, relative reactivity· Organic Compounds Containing Oxygen

Given below are two statements :Statement I :The boiling points of aldehydes and ketones are higher than hydrocarbons of comparable molecular masses because of weak molecular association in aldehydes and ketones due to dipole - dipole interactions.St…

Given below are two statements :

Statement I :

The boiling points of aldehydes and ketones are higher than hydrocarbons of comparable molecular masses because of weak molecular association in aldehydes and ketones due to dipole - dipole interactions.

Statement II :

The boiling points of aldehydes and ketones are lower than the alcohols of similar molecular masses due to the absence of H-bonding.

In the light of the above statements, choose the most appropriate answer from the options given below :

1. Statement I is incorrect but Statement II is correct.

2. Both Statement I and Statement II are correct.

3. Both Statement I and Statement II are incorrect.

4. Statement I is correct but Statement II is incorrect.

1 answer

Best answer

Answer: 2. Both Statement I and Statement II are correct.

Key idea: polarity of C=O gives dipole-dipole attraction but no hydrogen bonding between carbonyl molecules.

  • Statement I: aldehydes and ketones have higher boiling points than hydrocarbons of similar mass, due to weak dipole-dipole association. Correct.
  • Statement II: they boil lower than comparable alcohols because they cannot form intermolecular H-bonds. Correct.

Option 2.

Doubtly AI · 30 Oct 2026 AI-generated · not yet verified Report
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