1.

The suitable reagent for nuclear iodination of aromatic compounds is-

Answer»

`KI//CH_(3)COCH_(3)`
`I_(2)//CH_(3)CN`
`KI//CH_(3)COCH`
`I_(2)//HNO_(3)`

Solution :Iodobenzene cannot be prepared by direct iodination of aromatic ring because iodine is least reactive among halogens, the REACTION is reversible and the HI formed redues iodobenzene to benzene and `I_(2)`

But, on ADDITION of `HNO_(3)` , HI produced is oxidised to `I_(2)`. As a result, the reaction PROCEEDS in the forward direction to produce iodobenzene.


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