Dehydration reaction produces water from alcohols

Steps:

• Identify reaction types for propan-1-ol, a primary alcohol.
• Option A: Passing vapor over hot Al₂O₃ catalyzes intramolecular dehydration.
• Option B: Mixing with ethanoic acid and H₂SO₄ sets up esterification, requiring heat for reaction.
• Option C: Warming with HBr and H₂SO₄ promotes nucleophilic substitution to form alkyl halide.
• Determine which yields H₂O as a product based on standard equations.

Why A is correct:

• Dehydration equation: CH₃CH₂CH₂OH → CH₃CH=CH₂ + H₂O, where water forms via elimination.

Why the others are wrong:

• B: Esterification yields propyl ethanoate as main product; no water without specified heating.
• C: Substitution yields 1-bromopropane; water not listed as product in halide formation.

Final answer: A