Methods of preparation
Chlorobenzene is prepared by the direct chlorination of benzene in the presence of lewis acid catalyst like FeCl3
Chloro benzene is prepared by Sandmeyer reaction or Gattermann reaction using benzene diazonium chloride.
When aqueous solution of benzene diazonium chloride is warmed with Cu2Cl2 in HCl gives chloro benzene
Iodobenzene is prepared by warming benzene diazonium chloride with aqueous KI solution.
Fluoro benzene is prepared by treating benzenediazonium chloride with fluoro boric acid. This reaction produces diazonium fluoroborate which on heating produces fluorobenzene. This reaction is called Balz – schiemann reaction.
Chloro benzene is commercially prepared by passing a mixture of benzene vapour, air and HCl over heated cupric chloride .This reaction is called Raschig process.
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