A-LevelChemistryHalogen derivativesMay/June 2021Paper 1 Q241 Mark

A few drops of 2-bromopropane were placed in a test-tube. An equal volume of aqueous silver nitrate was added. A precipitate was formed. The experiment was repeated with 2-iodopropane. Which row is correct?

Q: What topic does this question test?

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

Acolour of precipitate from 2-bromopropane + AgNO₃(aq): cream, faster rate of reaction: 2-bromopropane + AgNO₃(aq)

Bcolour of precipitate from 2-bromopropane + AgNO₃(aq): yellow, faster rate of reaction: 2-bromopropane + AgNO₃(aq)

Ccolour of precipitate from 2-bromopropane + AgNO₃(aq): cream, faster rate of reaction: 2-iodopropane + AgNO₃(aq)

Dcolour of precipitate from 2-bromopropane + AgNO₃(aq): yellow, faster rate of reaction: 2-iodopropane + AgNO₃(aq)

✓ Correct Answer

The correct answer is C: colour of precipitate from 2-bromopropane + AgNO₃(aq): cream, faster rate of reaction: 2-iodopropane + AgNO₃(aq)

📋 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 2021 examination, Paper 1 Variant 2.

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