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Recall the reactions by which halogenoarenes can be produced: substitution of an arene with Cl₂ or Br₂ in the presence of a catalyst, AlCl₃ or AlBr₃, to form a halogenoarene, exemplified by benzene forming chlorobenzene and methylbenzene forming 2-chloromethylbenzene and 4-chloromethylbenzene.
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Explain the difference in reactivity between a halogenoalkane and a halogenoarene, as exemplified by chloroethane and chlorobenzene.
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