Compound X has been investigated for use as an artificial sweetener. [Figure of compound X, a glucose derivative with two -Cl and multiple -OH groups] The two C-Cl bonds can be hydrolysed by hot NaOH(aq). The C-O-C bonds cannot be hydrolysed by hot NaOH(aq). What are the numbers of specified types of –OH groups before and after hydrolysing the two C-Cl bonds?
✓ Correct Answer
The correct answer is C: before hydrolysis: secondary: 4, primary: 1, after hydrolysis: secondary: 5, tertiary: 1
📋 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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