A direct iodination of benzene is not possible because :

Iodine is an oxidising agent

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Resulting

C_{6} H_{5} I

is reduced to

C_{6} H_{6}

H I

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H I

is unstable

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The ring gets deactivated

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Solution

The correct option is A Iodine is an oxidising agent
This is because iodine is an oxidising agent so a direct iodonation of benzene is not possible because resulting $C_{6} H_{5} I$ is reduced to $C_{6} H_{6}$ by $H I$ .

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