CAIE A Level Chemistry 9701 · Halogen compounds

Halogen compounds: explain question

Explain4 marksStandard

4-Chloromethylbenzene can be prepared by reacting methylbenzene with chlorine.

(a) State the reagent and conditions needed for this reaction. (b) Explain why chlorobenzene is much less reactive than chloroethane towards nucleophilic substitution.

How this question is marked

4 marks, so the mark scheme is looking for about 4 separate creditworthy points. Making the same point twice in different words earns it once.

Explain means: Give the reasons or the mechanism: why or how something happens. Link each point to the next with because, so or which means. A list of facts with no links usually loses the reasoning marks.

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