A-LevelChemistryOrganic synthesisOct/Nov 2017Paper 1 Q241 Mark

2,3-dimethylpent-2-ene, (CH3)2C=C(CH3)CH2CH3, is treated with cold, dilute KMnO4. The product of this reaction is treated with an excess of concentrated H2SO4 at 180°C, giving a mixture of isomeric hydrocarbons with molecular formula C7H12. What is the name of one of the isomeric hydrocarbons?

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

The correct answer is B: cis-2,3-dimethylpenta-1,3-diene.

Q: What topic does this question test?

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

A2,3-dimethylpenta-1,2-diene

Bcis-2,3-dimethylpenta-1,3-diene

C2,3-dimethylpenta-1,4-diene

D3,4-dimethylpenta-1,3-diene

✓ Correct Answer

The correct answer is B: cis-2,3-dimethylpenta-1,3-diene

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

Source

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

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