Question

Arrange the following in order of increasing boiling point. Explain how you know.

I) CH3CH2OH

II) CH3CH2CH3

III) H3C-O-CH3

IV) CH3CH2NH2

Answer 1

The increasing order of the boiling point is as given.
II) CH3CH2CH3 < III) H3C-O-CH3 < I) CH3CH2OH < IV) CH3CH2NH2

The boiling point of non polar molecules is lower than the boiling point of polar molecules. Hence, the boiling point of II) CH3CH2CH3 is less than the boiling point III) H3C-O-CH3

Also if the molecule can form hydrogen bonds, it will have high boiling point. More is the number of H bonds, more is the boiling point.
Hence, the boiling point of I) CH3CH2OH is less than the boiling point IV) CH3CH2NH2