Chemical Forums
Chemistry Forums for Students => Organic Chemistry Forum => Topic started by: toadesque on December 13, 2009, 06:53:58 PM
-
It's asking me how you could distinguish between the 2 compounds by using infrared spectroscopy
(https://www.chemicalforums.com/proxy.php?request=http%3A%2F%2Fimg29.imageshack.us%2Fimg29%2F7479%2Ffefhy.jpg&hash=8015e26d1604e16ec41c1103dd70f4bea7f7565b)
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?
-
Draw resonance forms. How would that affect a given IR stretch?
-
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.
-
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.