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The iodination of benzene is a reversible reaction. Therefore, yield of C 6 H 5 I is very poor because HI combines with C 6 H 5 I and forms back the reactants. C 6 H 5 + I 2 ⇌ C 6 H 5 I + HI In the presence of oxidizing agent like HIO 3 or HNO 3 , the co-product HI is oxidised to iodine and iodination proceeds favourably in the forward direction. 5HI + HIO 3 + 3I 2 + 3H 2 O

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126.
Iodination of benzene is carried in the presence of oxidising agent like HIO₃. Give reason.

The iodination of benzene is a reversible reaction. Therefore, yield of C₆H₅I is very poor because HI combines with C₆H₅I and forms back the reactants.

C₆H₅ + I₂ ⇌ C₆H₅I + HI

In the presence of oxidizing agent like HIO₃ or HNO₃, the co-product HI is oxidised to iodine and iodination proceeds favourably in the forward direction.

5HI + HIO₃ + 3I₂ + 3H₂O