A-LevelChemistryHydrocarbonsMay/June 2011Paper 1 Q231 Mark

The products obtained by cracking an alkane, X, are methane, ethene and propene. The mole fraction of ethene in the products is 0.5. What is the identity of X?

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

The correct answer is B: C8H18.

Q: What topic does this question test?

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

AC6H14

BC8H18

CC9H20

DC11H24

✓ Correct Answer

The correct answer is B: C8H18

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

Source

This question appeared in the Cambridge A-Level Chemistry May/June 2011 examination, Paper 1 Variant 2.

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