Discussion
Why is deuterium substitution useful in assigning bands?
Answer: C
Replacing hydrogen roughly divides the frequency by 1.36, so a band that moves is one involving hydrogen and a band that does not is not. Intensity is little changed, preparation is generally harder, and the force constant is essentially unaffected because the electrons are the same. Changing one quantity in a relation and seeing which observations respond is the general way to assign a spectrum, and mass is the easiest quantity to change. The shared properties explain why these belong to one family, and the differences explain why more than one exists.
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