Question
Arrange the following compounds in order of increasing boiling point :
CH3CH2CH2OH, CH3COCH3,CH3CH2COOH, CH3OCH2CH3.
Solution
Propionic acid has stronger hydrogen bond than alcohol therefore the boiling point of propionic acid is higher than others. proponal is more polar than methoxy ethane. Therefore, the intermolecular diopole -dipole attraction is stronger in the methoxyethane. Hence increasing order of boiling point of the given compounds is as follows:
CH3OCH2CH3 < CH3COCH3 < CH3CH2CH2OH < CH3CH2COOH