Which one does not exhibit aldol condensation___________________?
Correct answer: C. Benzaldehyde
- A. Ethanal
- B. Acetone
- C. Benzaldehyde
- D. Butanone
Explanation
Aldol condensation requires at least one alpha hydrogen so that an enolate can form. Benzaldehyde has no alpha carbon and therefore cannot undergo self-aldol condensation, whereas ethanal, acetone and butanone do have alpha hydrogens. The common mistake is choosing acetone because ketones are sometimes incorrectly assumed not to give aldol reactions.
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About Reactivity of Aldehydes and Ketones
The polar carbonyl group makes aldehydes and ketones undergo nucleophilic addition, reduction and condensation reactions. Aldehydes are generally more reactive and oxidise readily to carboxylic acids, whereas ketones resist mild oxidation; reactions with hydrogen cyanide, sodium bisulfite and 2,4-DNP help identify their behaviour.
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