Rank the following compounds by solubility in water, most soluble to least soluble

I. CH3CH2OH II. CH3OCH3 III. CH3CH2NH2

a - I,II,III
b - I,III,II
c - II,I,III
d - III,I,II
e - III,II,I

Of these three items, ethanol (the first one) is the most soluble in water; it mixes
in all proportions with water. It is a polar molecule so it will mix readily with water.
The third compound, ethylamine, is liquid at STP but boils at 16.6°C (62°F); both
the liquid and gas forms are very soluble in water since it is somewhat polar also.
The second one, dimethyl ether, is a gas at STP and somewhat soluble in water
but less than the other two because it is less polar (but not completely non-polar).
So from most to least soluble, the order is: I, III, II (answer b)
Hope this answers your question.