A-LevelChemistryHalogen derivativesFeb/Mar 2021Paper 1 Q221 Mark
The diagram shows the structure of a bromo compound that may be formed by the reaction of bromine with a hydrocarbon. [Figure showing structure of 2,3-dibromo-2-methylpropane] Which row is correct? type of reaction mechanism A addition electrophilic B addition nucleophilic C substitution nucleophilic D substitution free-radical
Aaddition, electrophilic
Baddition, nucleophilic
Csubstitution, nucleophilic
Dsubstitution, free-radical
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The correct answer is D. This question tests the candidate's understanding of halogen derivatives 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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