Hexane, C6H14, is a colourless liquid. Two test-tubes contain equal amounts of hexane. 1 cm³ of bromine, Br2(aq), is added to both test-tubes. One test-tube is kept in the dark and the other is exposed to sunlight.
The table describes the appearance of each test-tube after one hour.
test-tube conditions | observations
---|---
in the dark | no change, mixture remains orange
in sunlight | colour of mixture fades to pale yellow

Q: What topic does this question test?

This question tests Hydrocarbons in A-Level Chemistry (syllabus code 9701). It is worth 12 marks.

Q: Which exam paper is this question from?

This question appeared in the Cambridge A-Level Chemistry May/June 2020 examination, Paper 2 Variant 3 (9701_s20_qp_23.pdf).

Question

Hexane, C6H14, is a colourless liquid. Two test-tubes contain equal amounts of hexane. 1 cm³ of bromine, Br2(aq), is added to both test-tubes. One test-tube is kept in the dark and the other is exposed to sunlight.
The table describes the appearance of each test-tube after one hour.
test-tube conditions | observations
---|---
in the dark | no change, mixture remains orange
in sunlight | colour of mixture fades to pale yellow

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