1.

The correct order of increasing ease of protonation is

Answer»

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

Solution :the presence of group with `+ R` effect (like `OMe`) INCREASES the BASICITY more at the p-position than ortho- and presence of `- R` group `(NO_(2))` decreases thre basicity. The presence of `+ I` group on N increases the basicity but less as compared to `+ R` group at para position. DUE to the presence of electron WITHDRAWING carbonyl group directly at N-decreases the basicity. So


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