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Aniline treated with $NaNO_2/HCl$ at $0-5^\circ$C on the lab bench gives:

AAniline hydrochloride, a simple salt of aniline and HCl
BPhenol, by replacement of $NH_2$ with $OH$ in water
CBenzenediazonium chloride, a stable salt at low temperature
DNitrobenzene, by oxidation of the amine on the bench
Answer & Solution
Correct answer: C. Benzenediazonium chloride, a stable salt at low temperature
Diazotisation of aromatic primary amine: aniline $\to$ benzenediazonium chloride at $0-5^\circ$C.
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