A-LevelChemistryAnalytical techniquesMay/June 2020Paper 1 Q381 Mark
Propanal reacts with hydrogen cyanide. Which absorptions are present in the infra-red spectrum of the product? 1 a weak absorption in the range 2200–2250 cm⁻¹ 2 a strong absorption in the range 3200–3600 cm⁻¹ 3 a strong absorption in the range 1040–1300 cm⁻¹
A1, 2 and 3 are correct
B1 and 2 only are correct
C2 and 3 only are correct
D1 only is correct
✓ Correct Answer
The correct answer is A: 1, 2 and 3 are correct
📋 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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