Spectroscopy on the MCAT

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I would know the general wavenumbers for important functional groups for IR. Other than that I don't think you need to know much.

To add onto this, if IR is truly something that you can't understand, just memorize the general range for -OH and carbonyl function groups. Those are a very common set of functional groups.
 
Once you've read a lot of NMRs and IRs, it becomes pretty easy to identify different compounds just based on the graphs or based on numbers and descriptions of peaks. Its more of a practice thing.
 
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