Q.
Amongst the compounds given, the one that would form a brilliant coloured dye on treatment with NaNO2 in dil. HCl followed by addition to an alkaline solution of β− naphthol is
As we know, benzenediazonium salt forms brilliant coloured dye with β -naphthol, the compound under consideration must be p-toluidine (c) as it is a primary aromatic amine. Primary aromatic amine, on treatment with NaNO2 in dil. HCI forms the corresponding diazonium chloride salt.