A-LevelChemistryHydroxy compoundsFeb/Mar 2023Paper 1 Q351 Mark
Two isomeric alcohols, W and X, have molecular formula C4H9OH. W is oxidised to carbonyl compound Y which gives a red precipitate with Fehling's solution. X is oxidised to carbonyl compound Z which does not give a red precipitate with Fehling's solution. Which of W and X gives a yellow precipitate with alkaline I2(aq)?
Ainsufficient data is given to answer this question
BW only
CX only
Dneither W nor X
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The correct answer is C. This question tests the candidate's understanding of hydroxy 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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