The number of free hydroxyl groups in morphine, codeine and heroin respectively is

A2, 1, 1
B2, 0, 0
C2, 1, 0
D1, 2, 0

Answer: C

Morphine has a phenolic and an alcoholic -OH (2). Codeine has the phenolic -OH converted to -OCH3, leaving one -OH. In heroin both -OH groups are acetylated, so none is free.

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