CAIE A Level Chemistry 9701 · Halogen compounds
2-bromobutane is a secondary halogenoalkane. When it is heated with sodium hydroxide in ethanol, an elimination reaction occurs, producing an alkene. When it is heated with aqueous sodium hydroxide, a nucleophilic substitution reaction occurs, producing an alcohol.
Compare these two reactions in terms of the reagent, the conditions, and the organic product formed.
5 marks, so the mark scheme is looking for about 5 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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