Answer: Alpha hydrogen.
- A Alpha hydrogen
- B Beta hydrogen
- C No hydrogen
- D Terminal hydrogen
Correct answer: A. Alpha hydrogen
Explanation: Alpha hydrogen (adjacent to the carbonyl) is essential for enolate formation in aldol condensation.
Curved arrows show the nucleophile attacking the carbonyl carbon while the C=O pi electrons move onto oxygen, giving a tetrahedral alkoxide intermediate.
Concept context
Aldehydes, ketones, carboxylic acids, and their derivatives (esters, amides, acid chlorides). Key reactions include nucleophilic addition, Aldol condensation, Cannizzaro, and Claisen. Very heavily tested in JEE and NEET.
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