Arrange the following compounds in increasing (weakest to strongest) order of basicity.

Question

Quizplus · Accepted Answer

The basicity of a compound depends upon the availability of its lone pair of electrons. The higher the availability of lone pair, the more basic the compound will be. Therefore, the compounds can be arranged in the increasing order of basicity as:
II < I < III < IV
Compound II has no lone pairs available for donation, making it the least basic. Compound I has one lone pair on the nitrogen atom, followed by compound III which has two lone pairs on the nitrogen atom. Compound IV has three lone pairs on the nitrogen atom, making it the most basic. Therefore, the correct order of basicity should be II < I < III < IV, which is given in choice C.

Arrange the Following Compounds in Increasing (Weakest to Strongest) Order