Chemistry - Nomenclature Question with Solution | TestHub

The decreasing order of basicity is 3 > 1 > 2.
The$\mathrm{\beta }-$carbon inuses$\mathrm{s}{\mathrm{p}}^3$-hybrid orbitals, while the$\mathrm{\beta }$-carbon in benzylamine uses$\mathrm{s}{\mathrm{p}}^2-$hybrid orbitals. The electron-withdrawing$\mathrm{p}-\mathrm{N}{\mathrm{O}}_2$makes the phenyl ring even more electron-withdrawing and base-weakening.