How is iodine introduced into the benzene ring using diazonium salts, and what is the resulting product when treated with potassium iodide?

Iodine can be introduced into the benzene ring using diazonium salts through the Sandmeyer reaction. In this process, the diazonium salt reacts with copper(I) iodide (CuI) or potassium iodide (KI) to replace the diazo group with an iodine atom. The resulting product is an aryl iodide. For example, if benzenediazonium chloride is treated with KI in the presence of copper(I) ions, the diazo group is substituted with iodine, yielding iodobenzene. This reaction is valuable for synthesizing aryl iodides, which are versatile intermediates in organic synthesis, particularly in the preparation of pharmaceuticals and agrochemicals.