Discussion
Why does hydrogen bonding lower a stretching frequency?
Answer: C
The hydrogen is drawn towards the acceptor atom, which lengthens and weakens the original bond, lowering its force constant and hence its frequency. Reduced mass and dipole moment are essentially unchanged, the latter affecting intensity rather than position. That an intermolecular interaction shows up as an intramolecular frequency shift is what makes infrared so sensitive to association, and it is why concentration studies are so informative.
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