Which of the following compounds will undergo self aldol condensation in the presence of cold dilute alkali?
Show Hint
- CH2 = CH − CHO
- CH ≡ C − CHO
- C6H5CHO
- CH3CH2CHO
The Correct Option is D
Solution and Explanation
Step 1: Understanding Aldol Condensation
- Aldol condensation occurs in aldehydes/ketones that contain at least one \(\alpha\)-hydrogen.
- The \(\alpha\)-hydrogen is removed by a base to form an enolate ion, which then attacks another carbonyl compound.
Step 2: Analyzing the Given Compounds
- \( CH_3CH_2CHO \) (Propionaldehyde) contains an \(\alpha\)-hydrogen, allowing aldol condensation.
- \( CH_2 = CH - CHO \) (Acrolein) and \( CH \equiv C - CHO \) do not easily form enolates due to resonance stabilization.
- \( C_6H_5CHO \) (Benzaldehyde) lacks \(\alpha\)-hydrogen, preventing aldol condensation.
Final Answer: \( CH_3CH_2CHO \) undergoes aldol condensation.
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