Chemistry - Complete s-block Question with Solution | TestHub

As$∆E\mathrm{N}>1.4$basic nature of hydoxide increases.
In alkali group metal on moving  top to bottom electro negativity decreases hence
$∆E\mathrm{N}\uparrow$so basic nature increases.
Basic nature of hydroxides increase down the group.
$\text{LiOH}<\text{NaOH}<\text{KOH}<\text{RbOH}$