Chemistry - GOC Question with Solution | TestHub

The decreasing order of basicity is 3 > 1 > 2 > 4.
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$\mathrm{p}-\mathrm{C}\mathrm{N}$makes the phenyl ring even more electron-withdrawing and base-weakening.