Classifying alcohols by the carbon attached to the OH group Steps:

• CH₃CH₂OH (ethanol) has OH on a carbon with one alkyl group (CH₃) and two H's, making it primary; LiAlH₄ deprotonates to alkoxide + H₂, but workup regenerates primary alcohol P.
• CH₃COCH₃ likely denotes methyl acetate (CH₃COOCH₃, common notation error); ester hydrolysis yields CH₃COOH (R) + CH₃OH (Q).
• CH₃OH (methanol) has OH on a carbon with no alkyl groups and three H's, making Q primary. Why B is correct:
• Primary alcohols have the OH attached to a CH₂OH or CH₃OH group; both P (CH₃CH₂OH) and Q (CH₃OH) fit this definition. Why the others are wrong:
• A: Q is primary, not secondary (no two alkyl groups on C-OH).
• C: P is primary, not secondary.
• D: Neither P nor Q is secondary.

Final answer: B