Why direct iodination is not possible
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Iodoarenes are also difficult to synthesise because the reaction is reversible and the HI produced is a strong reducing agent to reduce iodobenzene back to benzene.
C6H6 + I2 ⇋ C6H5I
Benzene Iodobenzene
Hence, this reaction is carried out in the presence of a strong oxidising agent like iodic acid or nitric acid, that oxidises the HI formed in the reaction to iodine, enabling the reaction to proceed in the forward direction.
5HI + HIO3 → 3H2O + 3I2
Iodic acid
C6H6 + I2 ⇋ C6H5I
Benzene Iodobenzene
Hence, this reaction is carried out in the presence of a strong oxidising agent like iodic acid or nitric acid, that oxidises the HI formed in the reaction to iodine, enabling the reaction to proceed in the forward direction.
5HI + HIO3 → 3H2O + 3I2
Iodic acid
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from which book this question has been taken?
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