Discussion
Which factor does NOT affect the chemical shift of a proton?
Answer: B
Shift is a property of the electronic environment, so electronegativity, ring and carbonyl anisotropy and hydrogen bonding all move a peak, sometimes by several ppm in the last case. Accumulating more scans improves signal to noise and changes nothing about position. Keeping clear which observables depend on the molecule and which on the experiment is the difference between interpreting a spectrum and merely describing it: shift, coupling and integral belong to the sample, while noise, resolution and artefacts belong to the instrument.
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