Which one exhibits aldol condensation____________________?
Correct answer: D. CH3COCH3
- A. HCHO
- B. C6H5CHO
- C. Cl3CCHO
- D. CH3COCH3
Explanation
Aldol condensation requires a carbonyl compound with at least one alpha hydrogen, which allows enolate formation. Acetone has alpha hydrogens and undergoes self-aldol condensation, whereas formaldehyde, benzaldehyde and chloral lack a suitable alpha hydrogen. Students may choose b because benzaldehyde is an aldehyde, but not every aldehyde can undergo aldol condensation.
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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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