A-LevelChemistryOrganic synthesisMay/June 2020Paper 1 Q401 Mark
A reaction mechanism is shown. [Diagram showing a reaction mechanism for the addition of HBr to an alkene followed by substitution by OH-.] Which statements about this reaction are correct? 1 Heterolytic bond fission occurs. 2 It is a substitution reaction. 3 OH¯ behaves as an electrophile.
A1, 2 and 3 are correct
B1 and 2 only are correct
C2 and 3 only are correct
D1 only is correct
✓ Correct Answer
The correct answer is B. This question tests the candidate's understanding of organic synthesis 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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