The increasing order of values of the following compounds is :
Option: 1 II<IV<III<I
Option: 2 II<I<III<IV
Option: 3I<II<III<IV
Option: 4 I<II<IV<III
III contains -M and -I group, hence it is the least basic.
IV contains -I group
I contains +M group and is more basic than II.
Thus order of strength: I > II > IV > III.
Order of : I < II < IV < III.
Therefore, Option(4) is correct.
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