A-LevelChemistryHalogen derivativesMay/June 2020Paper 1 Q221 Mark
Which row correctly shows the type of mechanism of each of the two reactions? C2H5Br + KCN CH3COCH3 + HCN electrophilic substitution electrophilic addition electrophilic substitution nucleophilic addition nucleophilic substitution electrophilic addition nucleophilic substitution nucleophilic addition
Aelectrophilic substitution, electrophilic addition
Belectrophilic substitution, nucleophilic addition
Cnucleophilic substitution, electrophilic addition
Dnucleophilic substitution, nucleophilic addition
✓ Correct Answer
The correct answer is D. This question tests the candidate's understanding of halogen derivatives within the Chemistrysyllabus. The examiner's mark scheme requires...
📋 Examiner Report & Trap Analysis
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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