Answer: Both methyl carbons.
- A Both methyl carbons
- B The central carbonyl carbon
- C One methyl carbon only
- D The oxygen
Correct answer: A. Both methyl carbons
Explanation: Both methyl carbons are alpha to the carbonyl in acetone, so all six hydrogens are alpha hydrogens.
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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