0653.C11.4.02 — Describe the test to distinguish between saturated and unsaturated hydrocarbons by their reaction with aqueous bromine: past paper questions
Real questions on 0653.c11.4.02 — describe the test to distinguish between saturated and unsaturated hydrocarbons by their reaction with aqueous bromine
The newest 6 of 6 written questions. Open one to see it on the real paper.
- 0653/33 · October/November 2025 · Q5b(i)[1]
Name the group of hydrocarbons to which ethene belongs. (i)
See it on the paper → - 0653/31 · May/June 2025 · Q6a(iv)[1]
is a product of the complete combustion of alkanes and leads to global warming (iv)
See it on the paper → - 0653/31 · May/June 2025 · Q6a(v)[1]
is a toxic gas formed by incomplete combustion (v)
See it on the paper → - 0653/43 · October/November 2024 · Q8d[2]
Aqueous bromine is added to a sample of an alkene and to a separate sample of an alkane. State the colour of each sample after the aqueous bromine is added. alkene
See it on the paper → - 0653/43 · May/June 2023 · Q8a[2]
State the two compounds shown in Fig. 8.1 that turn aqueous bromine colourless. Give a reason for your answer. compounds and reason
See it on the paper → - 0653/32 · February/March 2023 · Q8c[1]
Hydrocarbon W turns aqueous bromine colourless. State whether hydrocarbon W is saturated or unsaturated. Give a reason for your answer. hydrocarbon W reason
See it on the paper →
What examiners said
Carbon dioxide, CO2, was correctly identified by most candidates who were familiar with its role in contributing to global warming.
— Examiner report, May/June 2025, 0653/31 Q6(a)(iv) (Cambridge)
Some candidates knew that CO, carbon monoxide, is a toxic gas caused by incomplete combustion.
— Examiner report, May/June 2025, 0653/31 Q6(a)(v) (Cambridge)
Candidates who recognised the aqueous bromine test for alkenes had no difficulty in identifying ethene and butene and could explain their choices. Some candidates identified the two alkanes and others appeared to guess, often suggesting one of the alkenes and one of the alkanes.
— Examiner report, May/June 2023, 0653/43 Q8(a) (Cambridge)
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