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Topic: How could you tell whether or not a molecule *could* have pi bonds?  (Read 3602 times)

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Offline Jason

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How could you tell whether or not a molecule *could* have pi bonds?
« on: December 11, 2006, 09:31:19 PM »
Just by looking at its Lewis structure, how could you tell whether or not a molecule could have pi bonds?

Thanks in advance.
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Offline Ψ×Ψ

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Re: How could you tell whether or not a molecule *could* have pi bonds?
« Reply #1 on: December 11, 2006, 09:32:01 PM »
Degrees of unsaturation.  Google it.
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Offline tamim83

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Re: How could you tell whether or not a molecule *could* have pi bonds?
« Reply #2 on: December 12, 2006, 10:14:10 AM »
If the Lewis structure has multiple (i.e double or triple bonds) in it, than it has pi bonds.  A double bond has one sigma and one pi bond and a triple bond has one sigma bond and two pi bonds. 
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Offline mdlhvn

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Re: How could you tell whether or not a molecule *could* have pi bonds?
« Reply #3 on: December 12, 2006, 10:40:18 AM »
Right. And from Lewis structure, multiple bonds mean multiple electron pair shared.
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