The correct order of increasing basicity of the following compound is

Options

A. `I lt II lt III lt IV`
B. `II lt III lt IV lt I`
C. `II lt IV lt III lt I`
D. `III lt II lt IV lt I`.

Answer

D

Explanation

`p-OCH_(3)` group has `+ R` effect, and its presence increases basicity. The `p-NO_(2)` group has a strong `- R` effect and its presence decreases the basicity. Therefore, the strongest base is compound I and the weakest base is the compound III. The compound III is the weakest base due to the presence of `-overset(O)overset("||")(C)-` group

The order of basicity is
`III lt II lt IV lt I`