# Boiling Points

1. Jun 11, 2009

### temaire

1. The problem statement, all variables and given/known data
For the following molecules, predict the order of their boiling points from highest to lowest.

1. $$CH_{3}F$$
2. $$C_{2}H_{6}$$
3. $$CH_{3}OH$$
4. $$C_{2}H_{4}$$

3. The attempt at a solution
I think the answer is 3 4 2 1. I put 3 first because it is an alcohol and has hydrogen bonding. I put 4 second because it has a double bond. I put 2 third becuase although it has the same amount of electrons as $$CH_{3}F$$ it is a larger molecule. Am I correct?

2. Jun 19, 2009

### war485

I agree that methanol has the highest boiling point. As for the other 3 choices, rethink them. Why else (besides the extra small weight) makes the alkene have a higher boiling point? Compare that to electronegativity. Which factor's more important?