allery**Diazotisation** of a primary aromatic amine uses $NaNO_2 + HCl$ at
A$-78\,°C$
B$0$–$5\,°C$
C$80$–$100\,°C$
D$25$–$30\,°C$
Answer & Solution
Correct answer: B. $0$–$5\,°C$
$ArNH_2 + NaNO_2 + 2\,HCl \xrightarrow{0\text{-}5\,°C} ArN_2^+Cl^- + NaCl + 2\,H_2O$.
Low temperature keeps the diazonium salt from decomposing to $ArOH + N_2\uparrow$.
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