Chemistry - AMINES Question with Solution | TestHub

The basicity is a measure of a compound's ability to accept a proton $\left({\mathrm{H}}^{+}\right)$. (2) and (4) are weaker bases as the lone pair are involved in resonance. In (a) carbon adjacent to $\mathrm{N}$ is $s{p}^2$ hybridised hence is more electronegative therefore, pulls the electron density from nitrogen.