(n)An aryl diazonium salt is converted to an aryl iodide on reaction with potassium iodide.(o)Aryl diazonium fuoroborates are converted to aryl fuorides when heated. Both diazoniumsalt functions in the starting material undergo this reaction.(p)Hypophosphorous acid (H3PO2) reduces aryl diazonium salts to arenes.(q)Ethanol, like hypophosphorous acid, is an effective reagent for the reduction of aryl diazo-nium salts.(r)Diazotization of aniline followed by addition of a phenol yields a bright-red diazo-substitutedphenol. The diazonium ion acts as an electrophile toward the activated aromatic ring of thephenol.NaNO2, H2SO4H2OCH3H3CH3COHCH3H3CH3COHNNC6H52,3,6-Trimethyl-4-
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