CAIE A Level Chemistry 9701 · Halogen compounds
2-bromobutane is a secondary halogenoalkane. When it is heated with aqueous sodium hydroxide, the product is butan-2-ol. When it is heated with sodium hydroxide dissolved in ethanol, the product is a mixture of two alkenes.
Compare these two reactions in terms of the conditions used, the mechanism ( or ) of the nucleophilic substitution, and the role of the hydroxide ion in each.
6 marks, so the mark scheme is looking for about 6 separate creditworthy points. Making the same point twice in different words earns it once.
Compare means: Give similarities or differences between two things, and say which side each point belongs to. Write each point as a pair, for example: A is X, whereas B is Y. Two separate descriptions rarely earn the marks.
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