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A-LevelChemistryCarboxylic acids and derivativesMay/June 2019Paper 4 Q715 Marks

Amino acids can be separated by thin-layer chromatography. A mixture of amino acids is analysed using this technique. The chromatogram obtained is shown, drawn to scale. The table shows some R_f values for different amino acids in the solvent used. [Figure X.X]

Q: What topic does this question test?

This question tests Carboxylic acids and derivatives in A-Level Chemistry (syllabus code 9701). It is worth 15 marks.

📋 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 structured question tests Carboxylic acids and derivatives in A-Level Chemistry (syllabus code 9701). It is worth 15 marks.

Source

This question appeared in the Cambridge A-Level Chemistry May/June 2019 examination, Paper 4 Variant 2.

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