O-LevelChemistryOrganic Chemistry5070/11 · May/June 2018 · Q371 Mark

Z is a compound that: • can be formed, as the only other product, when the alkane C₈H₁₈ is cracked to produce butane • decolourises bromine water • has a branched chain structure. What is the formula of Z?

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ACH₂=CH-CH(CH₃)-CH₃ (3-methylbut-1-ene)

BCH₃-CH₂-CH₂-CH=CH₂ (Pent-1-ene)

CCH₃-C(CH₃)=CH-CH₃ (2-methylbut-2-ene)

DCH₂=C(CH₃)-CH₃ (2-methylpropene)

✓ Correct answer

D: CH₂=C(CH₃)-CH₃ (2-methylpropene)

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Topic: Organic Chemistry, O-Level Chemistry (syllabus 5070). Multiple choice, 1 mark.
Source: O-Level Chemistry, May/June 2018 Paper 1 Variant 1, question 37.

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