A-LevelChemistryHalogen derivativesOct/Nov 2019Paper 1 Q231 Mark
1-chloro-2-methylbutane reacts with sodium cyanide in ethanol in a nucleophilic substitution reaction. What is the most likely intermediate or transition state in this reaction? [Figure 23.1]
A[Diagram of a SN2-like transition state for 1-chloro-2-methylbutane where NC and Cl are partially bonded to the primary carbon]
B[Diagram of a SN2-like transition state for a secondary haloalkane where NC and Cl are partially bonded to the central carbon]
C[Diagram of a tertiary carbocation intermediate]
D[Diagram of a secondary carbocation intermediate]
✓ Correct Answer
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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