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Topic: Quick question regarding IR spectras  (Read 3322 times)

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Offline toadesque

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Quick question regarding IR spectras
« on: December 13, 2009, 06:53:58 PM »
It's asking me how you could distinguish between the 2 compounds by using infrared spectroscopy



sorry i know it's a terrible pic, made it quickly.

I don't really see how the groups are different? The double bond is in a different location on the 2nd one but what does that tell you?
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Offline 408

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Re: Quick question regarding IR spectras
« Reply #1 on: December 13, 2009, 08:24:56 PM »
Draw resonance forms.  How would that affect a given IR stretch?
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Offline orgopete

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Re: Quick question regarding IR spectras
« Reply #2 on: December 13, 2009, 09:41:45 PM »
The resonance structure suggestion can help identify which structure or the amount of single bond character (a weaker bond than a double bond) a compound may have.
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Offline bromidewind

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Re: Quick question regarding IR spectras
« Reply #3 on: December 16, 2009, 09:09:59 PM »
Look at the hybridizations of the C=O and the C=C on the first one. They are different than the second one. Hybridization peaks are fairly easy to see on IR spec.
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