In azo dye coupling reactions, benzene diazonium chloride acts as a weak electrophile. To successfully couple with phenol to form an orange/red dye, what must the pH of the solution be?

Question

Prashant Kotian · Accepted Answer

Correct answer: C. Phenol must be converted into the far more reactive phenoxide ion for the weak diazonium electrophile to attack it. Thus, a mildly alkaline medium (pH 9-10) is required.

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