Compounds Containing Nitrogen

Compound \(\mathrm{P}\) is neutral, \(\mathrm{Q}\) gives effervescence with \(\mathrm{NaHCO}_{3}\) while \(\mathrm{R}\) reacts with Hinsbergs reagent to give solid soluble in \(\mathrm{NaOH}\). Compound \(\mathrm{P}\) is