Question

Predict the order of increasing boiling point for the following compounds , ethane,methanol, and fluoromethane

Answer 1

can somone plz explain me how to do this ?

Answer 2

Well, boiling point depends on the order of the strength of \(\sf inter\)molecular forces that exist in that solution (not intramolecular).

Between the three listed, notice that ethane is the only one that is not polar, which tells you what? Also consider the bonding that methanol (hint, hint: that has -OH) and fluoromethane will have on an intermolecular level.

NOTE: I'm not going to give you a direct answer, this is organic chemistry, not chemistry 101. You need to be able to at least give some feedback and think critically.

Answer 3

still kinda confused

Answer 4

Do you understand intermolecular forces - London, dipole-dipole, and hydrogen bonding.

Answer 5

All substances have london forces, but other molecules also have more than just london, which accounts for a stronger bond.
Do you understand that when you are boiling something, you are breaking these bonds, taking them from either solid \(\rightarrow\) liquid \(\rightarrow\) gas, OR taking them from liquid \(\rightarrow\) gas, and in cases that can, solid \(\rightarrow\) gas. You're breaking these bonds.

Obviously, these intermolecular bonds vary in strength and are able to attract other molecules, which is what accounts for the higher boiling point.

HINT: Ethane only has london forces acting on it, which means this is the lowest boiling point of them.

Answer 6

i am stil confused about how i should know how a compound has what forces

Answer 7

By looking at the structures of each.