CAIE A Level Chemistry 9701 · Halogen compounds
2-bromobutane is a secondary halogenoalkane. When it is heated with ethanolic sodium hydroxide, elimination competes with nucleophilic substitution.
Compare these two reactions in terms of the reagent and conditions, the type of mechanism, and the organic products formed. In your answer, refer to the role of the hydroxide ion and the inductive effect of the alkyl groups.
7 marks, so the mark scheme is looking for about 7 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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