A-LevelChemistryCarbonyl compoundsOct/Nov 2011Paper 1 Q231 Mark
Ethanal, CH3CHO, can be reduced using NaBH4 in aqueous ethanol. This is a nucleophilic addition reaction. What could be the first step of this mechanism?
Aattack of an H⁻ ion at the carbon atom of the carbonyl group
Battack of an H⁻ ion at the oxygen atom of the carbonyl group
Cattack of an H⁺ ion at the carbon atom of the carbonyl group
Dattack of an H⁺ ion at the oxygen atom of the carbonyl group
✓ Correct Answer
The correct answer is A. This question tests the candidate's understanding of carbonyl compounds within the Chemistrysyllabus. The examiner's mark scheme requires...
📋 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...
🔒
Unlock the Examiner's Answer
Sign up for free to reveal the correct answer, the official mark scheme breakdown, and the examiner trap analysis for this question.
Sign Up Free to Unlock →Join thousands of Cambridge students already using Oracle Prep