Discussion
What happens to the coupling constant J when the spectrometer field is doubled?
Answer: C
The coupling constant is a property of the molecule, transmitted through its bonds, so it is unchanged in hertz at any field. Chemical shift differences in hertz do scale with field, which is why multiplets that overlap at low field separate cleanly at high field. Expressed in ppm the coupling appears to shrink as the field rises, which is precisely why coupling constants are always quoted in hertz. Running a sample at two fields and seeing which separations move is the standard test for distinguishing coupling from shift.
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