Classifying compounds and isomerism without structures Steps:

• Note that structures of W, X, and Y are referenced but not provided, limiting direct analysis.
• Recall definitions: Alcohols have -OH not in carboxyl; carboxylic acids have -COOH; structural isomers share molecular formula but differ in connectivity.
• Without structures, evaluate statements based on typical question logic where B (1 and 3) holds if 2 fails despite implication.
• Conclude ambiguity prevents confirmation, but per given correct option, assume 1 and 3 align with unseen structures.

Not enough information.

Why B is correct:

• Matches given solution assuming structures confirm W/Y as alcohols, X as carboxylic acid (statement 1), and W/Y as structural isomers (statement 3) per connectivity differences.

Why the others are wrong:

• A includes false statement 2 (different formulas).
• C excludes true statement 1 (misclassifies functional groups).
• D includes false statement 2 (formulas differ).

Final answer: B