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In iodination of arenes, HNO3 is added to

AReduce I2 to HI
BOxidise HI back to I2
CForm nitroarene only
DDissolve the arene
Answer & Solution
Correct answer: B. Oxidise HI back to I2
Iodination is reversible, and the oxidant removes HI as iodine, which shifts the equilibrium to the iodo product.
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