Chemistry - GOC Question with Solution | TestHub

The conjugate acid formed by addition of a proton to I is stabilised by two equivalent resonance structures and hence, compound I is the most basic. Further $2^{\circ }$ amines (III) are more basic than $1^{\circ }$ amines (II) while amides (IV) are least basic due to delocalisation of lone pair of electrons of $\mathrm{N}$ over the $\mathrm{CO}$ group. Thus, the order is : I $>$ III $>$ II $>$ IV.