Question

why does C2H5Cl has lower boiling point than C2H5OH?

Answer 1

Answer:

Ethyl chloride has a higher molecular weight than ethyl alcohol so it should have had higher boiling point

But ethyl alcohol because of the presence of polar hydroxyl group forms extensive hydrogen bonding with other ethyl alcohol molecules and forms a much greater bulk than ethyl chloride

So ethyl alcohol requires a higher boiling point in order to break the strong hydrogen bonds