A-LevelChemistryChemical bondingFeb/Mar 2017Paper 1 Q51 Mark

The characteristic smell of garlic is due to alliin. [Figure showing the structure of alliin with bond angles x, y and z marked]. What are the approximate bond angles x, y and z in a molecule of alliin?

Q: What is the correct answer to this A-Level Chemistry question?

The correct answer is C: 120° 120° 109°.

Q: What topic does this question test?

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

A90° 90° 109°

B120° 109° 90°

C120° 120° 109°

D180° 109° 109°

✓ Correct Answer

The correct answer is C: 120° 120° 109°

📋 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 Chemical bonding in A-Level Chemistry (syllabus code 9701). It is worth 1 mark.

Source

This question appeared in the Cambridge A-Level Chemistry Feb/Mar 2017 examination, Paper 1 Variant 2.

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