Iodination of benzene using I2 and CuCl2 yields iodobenzene.
Iodination is a reaction in which iodine is added to an aromatic ring. In the reaction just described, the iodine is believed to interact with cupric chloride to yield the I^+ electrophile which attacks the electron rich aromatic ring as shown.
The product is shown in the mechanism attached to this answer as the iodobenzene product is formed.
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