JEE Main · 2023 · 12 Apr 2023 · Shift 1 · Compounds Containing Nitrogen

$N,N$-dimethylaniline, compound A, reacts with nitrous acid generated in situ from $\mathrm{NaNO}{}_2$ and the mineral acid through electrophilic aromatic substitution. The electrophile is the nitrosonium ion $\mathrm{NO}{}^{+}$, a weak electrophile that attacks only the strongly activated ring and enters at the para position. The reaction is carried out at low temperature. The product B is $p$-nitroso-$N,N$-dimethylaniline, a ring (C-nitroso) compound, not an $N$-nitroso ammonium compound. Hence describing B as an $N$-nitroso ammonium compound is the incorrect statement.