Evaluating statements on alcohol properties Steps:

• Identify the homologous series: alcohols follow CnH2n+1OH, starting with methanol (n=1), ethanol (n=2), propanol (n=3), butanol (n=4).
• Check combustion: all alcohols burn in oxygen to form CO2 and H2O.
• Verify naming and reactions: ethanol is C2, oxidation applies to primary alcohols, hydration matches alkene carbons.
• Eliminate incorrect options based on definitions.

Why A is correct:

• Butanol, like all alcohols, combusts completely per the reaction C4H9OH + 6O2 → 4CO2 + 5H2O, producing carbon dioxide and water.

Why the others are wrong:

• B: An alcohol with two carbons is ethanol (C2H5OH); methanol has one carbon (CH3OH).
• C: All primary alcohols oxidize to carboxylic acids; e.g., propanol to propanoic acid, not just ethanol.
• D: Steam addition to ethene (C2) yields ethanol; propanol requires propene (C3).

Final answer: A