The 1H NMR spectrum of bromoethane shows a signal at 3.5ppm when the spectrum is recorded using a 60-MHz spectrometer. Where do you expect to see the signal if a 300- MHz instrument is used instead? A) 3.5 ppm B) 7.5 ppm C) 6.8 ppm D) 5.8 ppm E) none of these

A) 3.5 ppm

Explanation:

The signal still retains it position at 3.5ppm. This is because change in frequency of the spectrometer does not change the chemical shift values. It only changes the intensity of the signal.

As a rule of thumb; higher frequency, better resolution in NMR.

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the answer is b & c i believe : )