Benzene diazonium chloride readily undergoes an electrophilic aromatic substitution coupling reaction to directly form intensely colored azo dyes. When coupling specifically with phenol, what is the r

Question

Benzene diazonium chloride readily undergoes an electrophilic aromatic substitution coupling reaction to directly form intensely colored azo dyes. When coupling specifically with phenol, what is the rigorously required optimal pH environment for the reaction?

Prashant Kotian · Accepted Answer

Correct answer: C. The diazonium cation is an exceptionally weak electrophile. To react, it demands a powerfully activated nucleophilic ring. A mildly basic medium (pH 9-10) precisely converts the phenol into the vastly more nucleophilic phenoxide ion, immensely accelerating the coupling while strictly avoiding the highly basic destruction of the diazonium salt into a diazotate.

💡 Solution & Explanation

Practice 22,000+ questions like this