What is the upper temperature limit (in degrees Celsius) strictly maintained during the laboratory p — Amines Chemistry Question

💡 Solution & Explanation

The diazotization of primary aromatic amines using $NaNO_2$ and $HCl$ must be performed in an ice bath. The temperature is strictly maintained between $0^\circ C$ and $5^\circ C$ ($273-278\text{ K}$). Above $5^\circ C$, the benzenediazonium chloride intermediate becomes violently unstable and rapidly hydrolyzes with the solvent water to form phenol, releasing $N_2$ gas.