Discussion
Why is the region between 2000 and 2500 usually empty?
Answer: A
Only triple bonds and cumulated double bonds have force constants high enough, with atoms light enough, to reach that region, and they are uncommon. Detector, atmosphere and source are all adequate there apart from the carbon dioxide band at 2350. That the region's emptiness makes any band in it immediately significant is a good example of a negative expectation carrying information.
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