Discussion
Why does a carbon-hydrogen stretch appear near 3000 reciprocal centimetres?
Answer: C
The reduced mass of a carbon-hydrogen pair is close to hydrogen's own, far smaller than any bond between heavy atoms, and the frequency goes as one over its square root. The force constant is ordinary. Lone pairs and bond length are not the mechanism. That every bond to hydrogen appears at high wavenumber, whatever it is bonded to, follows from the mass alone and is the first pattern to notice in the group frequency region. Framing the question as which quantity the change acts upon makes the answer follow without calculation.
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