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 oxidizing agent?

Question

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 oxidizing agent?, Aryl iodides are more stable than aryl chlorides and bromides, so an oxidizing agent is needed to increase their reactivity., Because Iodination reactions are reversible in nature. To carry out the reaction in the forward direction, HI formed during iodination is removed by oxidation. HIO 4 is used as an oxidizing agent., Aryl iodides are less reactive than aryl chlorides and bromides, so an oxidizing agent is used to activate iodine molecules for substitution., Aryl iodides have a higher boiling point than aryl chlorides and bromides, so an oxidizing agent is used to reduce their boiling point.

MARKS App · Accepted Answer

Correct Option is : (B) Because Iodination reactions are reversible in nature. To carry out the reaction in the forward direction, HI formed during iodination is removed by oxidation. HIO 4 is used as an oxidizing agent.

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