Q.Aniline is converted to benzenediazonium chloride and then boiled with water. Write the reaction sequence and name the final aromatic product.

Aniline is treated with sodium nitrite and dilute hydrochloric acid at a low temperature (0-5 degrees C, necessary because the resulting diazonium salt decomposes above this range) to give benzenediazonium chloride: $\text{C}_6\text{H}_5\text{NH}_2 + \text{NaNO}_2 + 2\text{HCl} \rightarrow \text{C}_6\text{H}_5\text{N}_2^+\text{Cl}^- + \text{NaCl} + 2\text{H}_2\text{O}$. Boiling this diazonium salt with water hydrolyses it: water displaces the diazonium group, releasing nitrogen gas and giving phenol, $\text{C}_6\text{H}_5\text{N}_2^+\text{Cl}^- + \text{H}_2\text{O} \xrig …

Write the diazotisation step (low temperature, essential) first, then the hydrolysis step (boiling with water), tracki …

Running the diazotisation at room temperature or higher instead of 0-5 degrees C, which is a real practical requirement sin …