A-LevelChemistryOrganic synthesisFeb/Mar 2023Paper 1 Q281 Mark
When illudin S is heated under reflux with an excess of acidified potassium dichromate(VI), compound M is formed. [Figure 28.1: Reaction scheme showing illudin S (a complex bicyclic molecule with a cyclopropane ring, a ketone, an alkene, and two alcohol groups) being converted to compound M (a complex bicyclic molecule with two ketone groups and two carboxylic acid groups).] What is the molecular formula of compound M?
AC15H16O4
BC15H16O5
CC15H18O4
DC15H18O5
✓ Correct Answer
The correct answer is B: C15H16O5
📋 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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