(a) Primary aliphatic amines react with nitrous acid to form aliphatic
diazonium salts which being unstable, liberate nitrogen gas
quantitatively and alcohols Quantitative evolution of nitrogen is
used in estimation of amino acids and proteins (b) Aromatic amines react with nitrous acid at low temperatures
(273-278 K) to form diazonium salts, a very important class of
compounds used for synthesis of a variety of aromatic compounds
discussed in Section 9 7