A-LevelChemistryAnalytical techniquesFeb/Mar 2021Paper 1 Q301 Mark
When reactant X is treated with a suitable reagent, products Y and Z are formed. Infrared spectra of X, Y and Z are shown. [Figure showing IR spectra for reactant X, product Y, and product Z] Which row could be correct? X Y Z A 2,3-dimethylpent-2-ene propanone butanone B 2-methylpent-2-ene propanone propanoic acid C pent-2-ene ethanoic acid propanoic acid D propyl propanoate propan-1-ol propanoic acid
AX: 2,3-dimethylpent-2-ene, Y: propanone, Z: butanone
BX: 2-methylpent-2-ene, Y: propanone, Z: propanoic acid
CX: pent-2-ene, Y: ethanoic acid, Z: propanoic acid
DX: propyl propanoate, Y: propan-1-ol, Z: propanoic acid
✓ Correct Answer
The correct answer is B: X: 2-methylpent-2-ene, Y: propanone, Z: propanoic acid
📋 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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