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In the iodination of benzene, which compound causes the reduction of iodobenzene back to benzene?

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in Chemistry – Class 12 by (188k points)
In the iodination of benzene, which compound causes the reduction of iodobenzene back to benzene?

(a) Iodic acid

(b) Hydrogen iodide

(c) Nitric acid

(d) Mercuric oxide

I had been asked this question in a national level competition.

My question is from Preparation of Haloarenes in division Haloalkanes and Haloarenes of Chemistry – Class 12

1 Answer

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Correct choice is (b) Hydrogen iodide

For explanation I would say: The hydrogen iodide formed during the iodination of benzene is strong reducing agent which reverses the reaction. To prevent this, oxidising agents like HIO4, HNO3 and HgO are used in the reaction so as to oxidize the HI to iodine.

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