Discussion
Why is the fingerprint region hard to assign band by band?
Answer: D
Bending and skeletal vibrations involve many atoms moving together, so a band belongs to the molecule as a whole rather than to one bond and shifts unpredictably with any structural change. The bands are often strong, resolution is adequate, and solvent absorption is a separate problem. That the very complexity which prevents assignment is what makes the region diagnostic is the point worth grasping. Reading the definition literally, rather than recalling a formula, is the reliable route through questions of this shape.
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