What effect does increasing the operating frequency of a 1H NMRspectrum have on each value: (a) the chemical shift in 5; (b) thefrequency of an absorption in Hz; (c) the magnitude of a couplingconstant J in Hz?

(a)

The chemical shift calculated by using the below formula

Chemical shift = $\frac{\mathrm{Observed} \mathrm{chemical} \mathrm{shift} (\mathrm{in} \mathrm{Hzz}) \mathrm{downfield} \mathrm{from} \mathrm{TMS}}{\mathrm{frequency} \mathrm{of} \mathrm{the} \mathrm{NMR} \mathrm{spectrometer} ( \mathrm{in} \mathrm{MHz})}$

If there is an increase in the operating frequency, then there is no change in the chemical shift value.

(b)

The stronger the operating frequency, the larger the energy difference between the two nuclear spin states, and required higher frequency of an absorption.