A-LevelChemistryIntroduction to organic chemistryFeb/Mar 2022Paper 1 Q391 Mark

The diagrams show the structures of lycopene and β-carotene. [Figure 39.1] When lycopene is converted into β-carotene, what is the gain or loss of hydrogen atoms per molecule?

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

The correct answer is C: no change.

Q: What topic does this question test?

This question tests Introduction to organic chemistry in A-Level Chemistry (syllabus code 9701). It is worth 1 mark.

A4 gained

B2 gained

Cno change

D2 lost

✓ Correct Answer

The correct answer is C: no change

📋 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 Introduction to organic chemistry in A-Level Chemistry (syllabus code 9701). It is worth 1 mark.

Source

This question appeared in the Cambridge A-Level Chemistry Feb/Mar 2022 examination, Paper 1 Variant 2.

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