Chemistry - GOC Question with Solution | TestHub

More the electron density on $\mathrm{N}$, higher will be the basicity. Density on $\mathrm{N}$ is influenced by the (i) nature of the group (+I or -I) present in alkyl group or benzene nucleus and (ii) resonance (delocalisation of the electron present on $\mathrm{N}$ ). In ${\left({\mathrm{C}}_6{\mathrm{H}}_5\right)}_3\mathrm{N}$ : electron pair is delocalised to the maximum extent due to three benzene rings and hence least available for protonation, thus it will be least basic)