A-LevelChemistryHalogen derivativesFeb/Mar 2021Paper 1 Q251 Mark
Dibromopentanes can undergo 'double elimination' reactions to produce hydrocarbons. 2NaOH + C₅H₁₀Br₂ → C₅H₈ + 2NaBr + 2H₂O Which isomer produces only one hydrocarbon product?
A1,5-dibromopentane
B1,4-dibromopentane
C2,3-dibromopentane
D2,4-dibromopentane
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The correct answer is A. This question tests the candidate's understanding of halogen derivatives within the Chemistrysyllabus. The examiner's mark scheme requires...
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Common mistake: 62% of candidates selected the distractor because they confused... The examiner specifically designed this question to test whether students can differentiate between... To secure full marks, candidates must demonstrate...
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