A-LevelChemistryCarbonyl compoundsOct/Nov 2025Paper 1 Q341 Mark
An organometallic lithium compound, RLi, contains the nucleophile R⁻. CH3CH2Li reacts with pentan-2-one. The mechanism is nucleophilic addition. The first step produces an anion which is then protonated to form the final product. Which organic product is formed?
A[Diagram option A]
B[Diagram option B]
C[Diagram option C]
D[Diagram option D]
✓ Correct Answer
The correct answer is B. 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...
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