1.

The correct order of increasing basicity of the following compound is

Answer»

`I lt II lt III lt IV`
`II lt III lt IV lt I`
`II lt IV lt III lt I`
`III lt II lt IV lt I`.

Solution :`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`


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