Arrange the following compounds in the increasing order of their boiling points :
`CH_(3)CHO, CH_(3)CH_(2)OH, CH_(3)OCH_(3), CH_(3)CH_(2)CH_(3)`

Explanation

The given compounds have nearly same molecular masses out of all these compound propane is non-polar and will have, as such, lowest boiling point. Dimethyl ether is polar and as such will have liigher boiling point than propane. Ethanal, more polar than dimethyl ether will have higher boiling point than dimethyl ether. Ethyl alcohol has maximum polarity and maximum boiling point. Therefore, increasing order of boiling point :
`CH_3 CH_2 CH_3 lt CH_3 COCH_3 lt CH_3 CHO lt CH_3 CH_2 OH `