A-LevelChemistryHydrocarbons9701/12 · May/June 2015 · Q221 Mark

Four students, W, X, Y and Z, made the following statements about alkanes and alkenes. W 'Bromine reacts with alkanes by electrophilic substitution.' X 'Bromine reacts with alkenes by a free-radical addition mechanism.' Y 'Alkenes can be oxidised by acidified manganate(VII) ions.' Z 'Alkenes are formed from alkanes by cracking.' Which two students are correct?

AW and X

BW and Z

CX and Y

DY and Z

✓ Correct answer

D: Y and Z

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Topic: Hydrocarbons, A-Level Chemistry (syllabus 9701). Multiple choice, 1 mark.
Source: A-Level Chemistry, May/June 2015 Paper 1 Variant 2, question 22.

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