Benzene diazonium chloride physically couples with an aromatic amine like aniline to yield a yellow — Amines Chemistry Question

💡 Solution & Explanation

For optimal coupling with aniline, a mildly acidic medium (pH 4-5) is strictly required. This keeps the diazonium salt in its reactive cationic state while avoiding total deactivation of the aniline ring (which would occur in strong acid via anilinium ion formation).