A-LevelChemistryHydrocarbons9701/12 · May/June 2013 · Q211 Mark

Sorbic acid is used as a food preservative because it kills fungi and moulds. [Figure 21.1] Sorbic acid will react with • hydrogen in the presence of a nickel catalyst, • bromine in an organic solvent. How many moles of hydrogen and of bromine will be incorporated into one mole of sorbic acid by these reactions? [Figure 21.2]

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Amoles of hydrogen: 2, moles of bromine: 2

Bmoles of hydrogen: 2, moles of bromine: 2½

Cmoles of hydrogen: 3, moles of bromine: 2

Dmoles of hydrogen: 3, moles of bromine: 2½

✓ Correct answer

A: moles of hydrogen: 2, moles of bromine: 2

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Topic: Hydrocarbons, A-Level Chemistry (syllabus 9701). Multiple choice, 1 mark.
Source: A-Level Chemistry, May/June 2013 Paper 1 Variant 2, question 21.

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