O-LevelChemistryOrganic Chemistry5070/12 · May/June 2020 · Q331 Mark

Which structure represents an isomer of butane?

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AStraight chain C4H10 (n-butane).

BBranched chain C4H10 (2-methylpropane).

CStraight chain C5H12 (n-pentane).

DStraight chain C6H14 (n-hexane).

✓ Correct answer

C: Straight chain C5H12 (n-pentane).

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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 2, question 33.

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