CAIE A Level Chemistry 9701 · Halogen compounds
Describe a laboratory preparation of chlorobenzene from benzene, including essential reagents and conditions. Also describe how methylbenzene reacts under similar conditions. Then explain why chlorobenzene is less reactive towards nucleophilic substitution than chloroethane.
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.
Describe means: Say what happens or what something is like, in order and with detail. You are not being asked why. If there is data, quote it: name the trend, then give figures with units at the points where it changes.
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