A-LevelChemistryHalogen derivativesOct/Nov 2013Paper 1 Q241 Mark
A carbanion is an organic ion in which a carbon atom has a negative charge. A carbocation is an organic ion in which a carbon atom has a positive charge. The reaction between aqueous sodium hydroxide and 1-bromobutane proceeds by an SN2 mechanism. How should the first step in the mechanism be described?
Aattack by a nucleophile on a carbon atom with a partial positive charge
Bheterolytic bond fission followed by an attack by an electrophile on a carbanion
Cheterolytic bond fission followed by an attack by a nucleophile on a carbocation
Dhomolytic bond fission followed by an attack by a nucleophile on a carbocation
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The correct answer is A. This question tests the candidate's understanding of halogen derivatives within the Chemistrysyllabus. The examiner's mark scheme requires...
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