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Homework Help: Boiling Points

  1. Jun 11, 2009 #1
    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. [tex]CH_{3}F[/tex]
    2. [tex]C_{2}H_{6}[/tex]
    3. [tex]CH_{3}OH[/tex]
    4. [tex]C_{2}H_{4}[/tex]

    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 [tex]CH_{3}F[/tex] it is a larger molecule. Am I correct?
  2. jcsd
  3. Jun 19, 2009 #2
    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?
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