Why the boling point of ethanol is much higher than dimethyl ether?

The above two answers are correct to some extent. The main reason is alcohols are having an important property called"hydrogen bonding"

Alcohol represent as R-OH.

The bond formed between O-H.......O(This Oxygen is from next Alcohol molecule) is calle Hydrogen bond.

R-O-H....O-R and it will go on like this... So inorder to break these bonds you need to supply some more energy interms of heat.

In case of ethers, the O is attache to alkyl groups..so no Hydrogen bonding...

YOu got it?

The strength of bonds within the molecule isnt related to boiling point, what is important is the strength of the attractions between the molecules. Because the alcohol has an OH group, you get what is known as hydrogen bonding, a relatively strong type of intermolecular attraction. The ether doesnt have this and thus the interaction between molecules is weaker.

ethanol is an alcohol...and due to the alkyl-alcohol bond, the boiling pt. of ethanol is higher than the corresponding alkanes..while in dimethyl ether..u have two methyl groups linked to an oxygen...the bond isnt that strong