Arrange the following compounds in decreasing order of their boiling points. CH3CHO, CH3CH2OH, CH3OCH3, CH3CH2CH3

The boiling point of alcohols is the highest among the given compound, because of the formation of hydrogen bonding which is a strong bond. Then comes the aldehydes which have higher boiling point than hydrocarbons and ethers, since they are polar compounds and have higher dipole –dipole interactions. Among ethers and hydrocarbons, ethers have the higher boiling point and the hydrocarbons have the least boiling point due to weak vander Waals interactions. So the correct order of compounds on the decreasing order of boiling points is as follows: 퐶퐻3퐶퐻2푂퐻> 퐶퐻3퐶퐻푂> 퐶퐻3푂퐶퐻3 > 퐶퐻3퐶퐻2퐶퐻3