A-LevelChemistryHalogen derivativesFeb/Mar 2018Paper 1 Q211 Mark
An organic ion containing a carbon atom with a negative charge is called a carbanion. An organic ion containing a carbon atom with a positive charge is called a carbocation. The reaction between aqueous sodium hydroxide and 1-bromobutane proceeds by an Sɴ2 mechanism. What is the first step in the mechanism?
Aattack by a nucleophile on a carbon atom with a partial positive charge
Bheterolytic bond fission followed by attack by an electrophile on a carbanion
Cheterolytic bond fission followed by attack by a nucleophile on a carbocation
Dhomolytic bond fission followed by 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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