order

more is the reactivity of substrate , more is its affinity for hydration.
cyclic ketones are more reactive thn aliphatic ones due to ring strain along with added torsional strain. thus iii) would hv least equilibrium constant.

now, among the 1st two , 3-membered ring is always more reactive thn four membered one.

thus order is : iii) < i) < ii)

nice work...
just one typing mistake u made in last...
iii)<i)<ii)

sorry.edited. i really need to hv a specs on.

hehe...but u have ur brain ON every time..thats more imp...