A-LevelChemistryHalogen derivativesFeb/Mar 2025Paper 1 Q351 Mark
1-chloro-2-methylpropane and 2-bromo-2-methylbutane react separately with aqueous silver nitrate in ethanol. Both reactions proceed via nucleophilic substitution and a precipitate is formed. The time taken for 1-chloro-2-methylpropane to form a precipitate is T1. The time taken for 2-bromo-2-methylbutane to form a precipitate is T2. Which row is correct?
A1-chloro-2-methylpropane SN1 T2 > T1
B1-chloro-2-methylpropane SN2 T1 > T2
C2-bromo-2-methylbutane SN1 T2 > T1
D2-bromo-2-methylbutane SN2 T1 > T2
✓ 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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