A-LevelChemistryHalogen derivativesMay/June 2017Paper 1 Q231 Mark

Aqueous sodium hydroxide reacts with 1-bromopropane to give propan-1-ol. What should be included in a diagram of the first step in the mechanism?

Q: What topic does this question test?

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

Acurly arrow from a lone pair on the OH⁻ ion to the δ⁺ atom of 1-bromopropane

Bcurly arrow from the C⁺ atom of 1-bromopropane to the OH⁻ ion

Ccurly arrow from the C-Br bond to the C atom

Dthe homolytic fission of the C-Br bond

✓ Correct Answer

The correct answer is A: curly arrow from a lone pair on the OH⁻ ion to the δ⁺ atom of 1-bromopropane

📋 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.

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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 2017 examination, Paper 1 Variant 2.

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