Discussion
What does dynamic NMR study?
Answer: A
When a molecule exchanges between two environments, the lineshape changes with the rate: two sharp lines at slow exchange, a broad coalesced hump at intermediate rate and a single sharp averaged line when fast. Measuring the temperature of coalescence yields the activation energy of the process, which is how hindered rotation about an amide bond is quantified. The other options describe spinning artefacts, ordinary relaxation and magnet behaviour rather than any study of rates. It is one of the few spectroscopic methods to measure a rate constant directly.
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