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Topic: Why does propane have a lower boiling point than cyclopropane?  (Read 6044 times)

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Offline Bob Sacamano

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Why does propane have a lower boiling point than cyclopropane?
« on: September 18, 2010, 10:51:56 PM »
I get why cyclopropane has a higher mp because it can xtalize better but I don't see why it has a higher boiling point as well.

Offline Jorriss

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Re: Why does propane have a lower boiling point than cyclopropane?
« Reply #1 on: September 18, 2010, 11:02:05 PM »
Have you thought about the intermolecular forces and energies present in both molecules are compared them?

Offline Bob Sacamano

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Re: Why does propane have a lower boiling point than cyclopropane?
« Reply #2 on: September 18, 2010, 11:29:10 PM »
The predominant intermolecular force must be van der waals forces. Propane has more bonds / molecule than cyclopropene but how does that effect the strength of the intermolecular forces?

Offline Jorriss

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Re: Why does propane have a lower boiling point than cyclopropane?
« Reply #3 on: September 18, 2010, 11:54:05 PM »
Yeah, all there is van der waals. So that means for some reason, cyclopropane must have more significant intermolecular forces than n-propane.

Can you put forth a rationale for why cyclopropanes van der waal forces would be more significant?

Offline Bob Sacamano

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Re: Why does propane have a lower boiling point than cyclopropane?
« Reply #4 on: September 25, 2010, 04:45:58 PM »
No, I can't. That's why I'm asking.

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