Esterification of primary alcohols produces water

Steps:

• Identify the reaction type for each option involving primary alcohols.
• Reaction 1: Acid-catalyzed esterification with ethanoic acid forms an ester.
• Reaction 2: Nucleophilic substitution with concentrated HBr forms an alkyl bromide.
• Reaction 3: Catalytic dehydration over heated Al2O3 forms an alkene.

Why A is correct:

• Esterification follows the formula ROH + CH3COOH ⇌ CH3COOR + H2O, where water is eliminated as a by-product.

Why the others are wrong:

• B: Substitution replaces -OH with -Br to give RBr directly; no water forms.
• C: Dehydration removes H and OH to give an alkene; water is not a distinct product.

Final answer: A