A-LevelChemistryHalogen derivatives9701/12 · Feb/Mar 2025 · 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

B: 1-chloro-2-methylpropane SN2 T1 > T2

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Topic: Halogen derivatives, A-Level Chemistry (syllabus 9701). Multiple choice, 1 mark.
Source: A-Level Chemistry, Feb/Mar 2025 Paper 1 Variant 2, question 35.

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