How many alpha-hydrogens (H on carbons directly bonded to the carbonyl carbon) does the ketone shown have?

Answer: B

The drawn compound is pentan-3-one, CH3CH2-CO-CH2CH3. Only the two CH2 carbons are alpha, with 2 H each, so 4 alpha-hydrogens (RDKit count 4). The CH3 hydrogens are beta.

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