Which of the following pairs of aryl halides | vedclass

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(D) The correct answer is $D$.Electrophilic substitution of benzene with iodine is a reversible reaction,requiring an oxidizing agent (like $HNO_3$ or

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Aryl iodide and aryl fluoride

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(D) The correct answer is $D$.Electrophilic substitution of benzene with iodine is a reversible reaction,requiring an oxidizing agent (like $HNO_3$ or $HIO_4$) to remove $HI$ and drive the reaction forward; hence,it is not considered a direct preparation.Fluorination is extremely exothermic and highly reactive,making it difficult to control for direct electrophilic substitution.Therefore,aryl iodide and aryl fluoride cannot be prepared directly by simple electrophilic substitution.

Which of the following pairs of aryl halides can $\underline{NOT}$ be prepared directly by electrophilic substitution?

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