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Give preparation of haloarenes from amine compounds. |
Answer» Solution :(i) Diazotization : When a primary aromatic amine, DISSOLVED or suspended in cold aqueous mineral acid, is treated with SODIUM nitrite, a diazonium salt is formed. The reaction is known as diazotization.<BR> (ii) Sandmeyer.s reaction : Mixing the solution of freshly prepared diazonium salt with cuprous chloride or cuprous bromide results in the replacement of the diazonium group by - Cl or - Br.  (III) Iodide product : Replacement of the diazonium group by iodine does not required the presence of cuprous halide and is done simply by SHAKING the diazonium salt with potassium iodide. 
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