What this tests
Syllabus point 11.1 — Formulae, functional groups and terminology, in Organic chemistry. Difficulty easy (estimated from the question's demands, not a Cambridge rating).
Cambridge IGCSE Chemistry 0620 · 11.1 Formulae, functional groups and terminology
June 2018 · Paper 21 · Question 39
One real Cambridge question from Organic chemistry, with the official answer.