Benzene diazonium chloride undergoes an electrophilic aromatic substitution coupling reaction with phenol to form an orange azo dye. What is the optimal pH environment for this reaction?

Question

Prashant Kotian · Accepted Answer

Correct answer: C. The diazonium cation is a weak electrophile. A mildly basic medium (pH 9-10) accurately converts the phenol into the vastly more nucleophilic phenoxide ion, immensely accelerating the coupling while avoiding the highly basic destruction of the diazonium salt.

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