Aryl chlorides and bromides can be easily prepared by electrophilic substitution of arenes with chlorine and bromine respectively in the presence of Lewis acid catalysts. But why does preparation of aryl iodides requires presence of an oxidising agent?

<p><span data-teams="true">This is a short answer type question as classified in NCERT Exemplar</span></p><p><span data-teams="true">Because <strong>HI</strong> is produced throughout the process, iodination reactions are reversible in nature. To keep the reaction moving ahead, we must remove the <strong>HI</strong> by an oxidation process using oxidising agents such as <strong>HIO₄</strong>.</span></p>

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