A Levels Chemistry (9701)•9701/11/O/N/20
Explanation
Water Production in Alcohol Reactions Steps:
- Reaction 1: Primary alcohol (ROH) + ethanoic acid (CH3COOH) undergoes esterification to form ester + H2O.
- Reaction 2: ROH + concentrated HBr forms alkyl bromide (RBr) + H2O via nucleophilic substitution.
- Reaction 3: ROH vapor over heated Al2O3 dehydrates to alkene + H2O at high temperature.
- All three reactions eliminate water as a byproduct.
Why A is correct:
- Option A identifies reactions 1, 2, and 3, matching the general equation for each: esterification (ROH + R'COOH → R'COOR + H2O), halogenation (ROH + HX → RX + H2O), and dehydration (ROH → alkene + H2O).
Why the others are wrong:
- B omits reaction 3, ignoring dehydration's water production.
- C omits reaction 1, overlooking esterification's condensation.
- D omits reaction 2, excluding substitution's water elimination.
Final answer: A
Topic: Hydroxy compounds
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