O-LevelChemistryOrganic Chemistry5070/11 · May/June 2020 · Q351 Mark

The molecules of two hydrocarbon compounds X and Y each contain only four carbon atoms. X is saturated and Y is unsaturated. Which statements are correct? 1 Under suitable conditions Y polymerises. 2 The complete combustion of 1 mole of Y produces more carbon dioxide than the complete combustion of 1 mole of X. 3 One molecule of Y contains more hydrogen atoms than one molecule of X.

A1 only

B3 only

C1 and 2

D2 and 3

✓ Correct answer

A: 1 only

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Topic: Organic Chemistry, O-Level Chemistry (syllabus 5070). Multiple choice, 1 mark.
Source: O-Level Chemistry, May/June 2020 Paper 1 Variant 1, question 35.

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