Answer: No alpha hydrogen.
- A No alpha hydrogen
- B One alpha hydrogen
- C Two alpha hydrogens
- D Any hydrogen
Correct answer: A. No alpha hydrogen
Explanation: Aldehydes without alpha hydrogen cannot form enolates, so they undergo Cannizzaro disproportionation.
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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