Question:
Base catalyzed aldol condensation occurs with
Base catalyzed aldol condensation occurs with
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Aldol condensation needs an alpha hydrogen.
Updated On: Nov 12, 2026
- 2,2-dimethyl propanal
- Propanal
- Benzaldehyde
- 2,2-dimethyl propanal and Benzaldehyde
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The Correct Option is B
Solution and Explanation
Step 1: Understanding the Concept
Base-catalysed aldol condensation needs at least one alpha hydrogen, which the base removes to form an enolate ion.
Step 2: Check each aldehyde
Propanal, \(\text{CH}_3\text{CH}_2\text{CHO}\), has two alpha hydrogens. 2,2-Dimethylpropanal has a quaternary alpha carbon, and benzaldehyde has no alpha carbon with hydrogen.
Step 3: Conclusion
Aldehydes without alpha hydrogens give the Cannizzaro reaction. So only propanal undergoes aldol condensation.
Final Answer:
Only propanal undergoes aldol condensation. \[ \boxed{\text{(B) }\text{Propanal}} \]
Base-catalysed aldol condensation needs at least one alpha hydrogen, which the base removes to form an enolate ion.
Step 2: Check each aldehyde
Propanal, \(\text{CH}_3\text{CH}_2\text{CHO}\), has two alpha hydrogens. 2,2-Dimethylpropanal has a quaternary alpha carbon, and benzaldehyde has no alpha carbon with hydrogen.
Step 3: Conclusion
Aldehydes without alpha hydrogens give the Cannizzaro reaction. So only propanal undergoes aldol condensation.
Final Answer:
Only propanal undergoes aldol condensation. \[ \boxed{\text{(B) }\text{Propanal}} \]
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