A-LevelChemistryCarbonyl compoundsFeb/Mar 2021Paper 1 Q261 Mark
The diagram shows the formation of compound Y from compound X in a chemical reaction. R₁ and R₂ are alkyl groups. [Figure showing X + HCN (KCN catalyst) -> Y, where Y has an -OH and -CN group on the same carbon, R1 and R2 are alkyl groups branching from that carbon] Which row about this reaction is correct? mechanism compound X A electrophilic addition aldehyde B electrophilic addition ketone C nucleophilic addition ketone D nucleophilic addition aldehyde
Aelectrophilic addition, aldehyde
Belectrophilic addition, ketone
Cnucleophilic addition, ketone
Dnucleophilic addition, aldehyde
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The correct answer is C. This question tests the candidate's understanding of carbonyl compounds within the Chemistrysyllabus. The examiner's mark scheme requires...
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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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