Discussion
What is the group frequency region used for?
Answer: B
Above about 1500 reciprocal centimetres each functional group absorbs at a characteristic wavenumber almost regardless of the rest of the molecule, so the region reports which groups are present. Compound identity is settled by the fingerprint region, concentration by band intensity, and molecular weight by mass spectrometry. Two regions answering two different questions is what makes an infrared spectrum useful both for classification and for identification.
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