Consider the classic azo coupling reaction between benzene diazonium chloride and phenol in a slightly alkaline medium to form a highly colored azo dye. How many nitrogen atoms are directly participat

Question

Consider the classic azo coupling reaction between benzene diazonium chloride and phenol in a slightly alkaline medium to form a highly colored azo dye. How many nitrogen atoms are directly participating in the continuous $\pi$ -conjugation bridge connecting the two aromatic rings in the final dye molecule?

Prashant Kotian · Accepted Answer

Correct answer: 2. The coupling of a diazonium salt with phenol (at pH 9-10) yields p-hydroxyazobenzene. The two aromatic rings are joined by an azo linkage (). This specific bridge consists of exactly 2 nitrogen atoms, which are hybridized and provide the extended -conjugation responsible for the compound's intense color.

💡 Solution & Explanation

Practice 22,000+ questions like this