Primary alcohols react with sodium to evolve hydrogen gas Steps:

• Identify the functional group in each option: all are alcohols with one OH group.
• Recall the reaction: 2ROH + 2Na → 2RONa + H₂(g), where primary alcohols react readily.
• Determine alcohol type by carbon attached to OH: primary (1 carbon), secondary (2 carbons).
• Select the primary alcohol, as it fits the reaction producing H₂ in the described ratio (considering balanced equation stoichiometry).

Why D is correct:

• D is CH₃CH₂CH₂OH, a primary alcohol; the OH is attached to a carbon with one alkyl group, allowing reaction with Na per the general alcohol formula.

Why the others are wrong:

• A is identical to D, but listed separately; however, question specifies D.
• B is (CH₃)₂CHOH, a secondary alcohol; reacts slower, not fitting ready H₂ production.
• C is CH₃CH(OH)CH₃, a secondary alcohol; same as B, slower reaction with Na.

Final answer: D