A-LevelChemistryHalogen derivativesMay/June 2017Paper 1 Q261 Mark
2-bromo-2-methylpropane undergoes nucleophilic substitution when heated under reflux with an aqueous solution of sodium hydroxide. Which row is correct?
ASN1, the hydroxide ion is helped in its approach to the central carbon atom by the methyl groups
BSN1, the intermediate carbocation is stabilised by the inductive effect of the methyl groups
CSN2, the hydroxide ion is hindered in its approach to the central carbon atom by the methyl groups
DSN2, the intermediate carbocation is destabilised by the inductive effect of the methyl groups
✓ Correct Answer
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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