Arrange the given species in the increasing order of group electronegativity.

I -NO₂

II -F

III -H

IV -OH

III < IV < II < I

III < IV < II < I is the correct order of electronegativity.

As F is the most electronegative element because electronegativity increases on moving left to right in a periodic table.

But -NO₂ is more electronegative than F because the N and two O atoms both being electronegative increases electronegativity.

-OH is more electronegative than -H as O is the 2nd most electronegative element in the periodic table.