Haloalkanes and Haloarenes

Question

Give reasons:

Dry gaseous hydraulic acid and not their aqueous solutions are used to prepare alkyl halides from alkenes.

Answer

Dry hydrogen halides are stronger acids and better electrophiles than the H3O+ ion formed in their aqueous solutions. Moreover, H2O is a nucleophile and may react with Rto form an alcohol instead of alkyl halide.

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