CBSE Class 12-science Answered

For ketones and aldehydes of similar molecular mass, ketones have higher boiling point.

This is due to the fact that its carbonyl group in ketone is more polarized than in aldehydes.

The presence of two electron donating alkyl groups around the C=O group in ketone makes the molecule more polar than in case of aldehydes.

Hence, the interactions between molecules of ketones is stronger than between molecules of aldehydes, which results into a higher boiling point of ketone to that of corresponding aldehyde of similar mass.