What this tests
Syllabus point 11.5 — Alkenes, in Organic chemistry. Difficulty easy (estimated from the question's demands, not a Cambridge rating).
Also set in
The same question, as Cambridge printed it in other papers.
Cambridge IGCSE Chemistry 0620 · 11.5 Alkenes
June 2018 · Paper 23 · Question 37
One real Cambridge question from Organic chemistry, with the official answer. Cambridge has printed this question 3 times.