All the chemicals used in this work were of analytical grade.
They included p-acetamidophenol, aniline, p-bromoaniline, pmethoxyaniline, and p-nitroaniline (Sigma) sodium nitrite and
sodium hydroxide (Adwik). Organic solvents (spectroscopic pure
from BDH) used included absolute ethyl alcohol, diethylether and
dichloromethane