The correct order of increasing basicity is

Question

The correct order of increasing basicity is (A) II < III < I (B) I ≈ III < II (C) I < II < III (D) III < I < II

Tardigrade Admin · Accepted Answer

II is most basic because delocalisation of electron pair leads to negative charge on N making it electron-rich and hence liable to be attacked by proton very easily. Moreover, the corresponding protonated species is very much stable because of equivalent contributing structures.

Q. The correct order of increasing basicity is

II < III < I

I $\approx$ III < II

I < II < III

III < I < II

II is most basic because delocalisation of electron pair leads to negative charge on $N$ making it electron-rich and hence liable to be attacked by proton very easily. Moreover, the corresponding protonated species is very much stable because of equivalent contributing structures.