A-LevelChemistryHalogen derivativesMay/June 2013Paper 1 Q231 Mark
Aqueous sodium hydroxide reacts with 2-bromo-2-methylpropane to give 2-methylpropan-2-ol. The reaction proceeds by an Sɴ1 mechanism. How should the first step in the mechanism be described?
Aby a curly arrow from a lone pair on the OH⁻ ion to the C⁺ atom of 2-bromopropane
Bby a curly arrow from the C–Br bond to the Br atom
Cby a curly arrow from the C–Br bond to the C atom
Dby the homolytic fission of the C–Br bond
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The correct answer is B. 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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