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WAEC Chemistry 2025 Theory — Question 23

Question 23 of 70 from the West African Examinations Council (WAEC) Chemistry 2025 Theory paper, with the correct answer and a full explanation.

2(c)(i). State the type of reaction illustrated by: I. nC2H4 -> (CH2-CH2)n; II. C2H4 + 3O2 -> 2CO2 + 2H2O; III. C2H4 + [O] -> epoxyethane (H2C-CH2 with O bridge).

Model answer

I. Polymerization. II. Combustion. III. Oxidation/addition reaction.

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