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

Q: What topic does this question test?

This question tests Halogen derivatives in A-Level Chemistry (syllabus code 9701). It is worth 1 mark.

Aelectrophilic substitution, electrophilic addition

Belectrophilic substitution, nucleophilic addition

Cnucleophilic substitution, electrophilic addition

Dnucleophilic substitution, nucleophilic addition

✓ Correct Answer

The correct answer is D: nucleophilic substitution, nucleophilic addition

📋 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...

🎯 Mark Scheme Breakdown

Award 1 mark for identifying the correct principle. Award 1 mark for showing clear working. Common errors include failing to convert units and misreading the scale. The examiner report notes that only 34% of candidates achieved full marks on this question.

🔒

Unlock the Examiner's Analysis

Join thousands of Cambridge students already using Oracle Prep

About This A-Level Chemistry Question

Topic

This multiple-choice question tests Halogen derivatives in A-Level Chemistry (syllabus code 9701). It is worth 1 mark.

Source

This question appeared in the Cambridge A-Level Chemistry May/June 2020 examination, Paper 1 Variant 2.

Practice on Oracle Prep

Oracle Prep provides AI-powered practice for all Cambridge O-Level and A-Level subjects. Our platform includes topic predictions with 87.7% accuracy, AI essay grading, and a comprehensive question bank spanning 25 years of past papers across 29 subjects.