Question

At an operating frequency of 350 MHz, the shift (in Hz) of resonance from TMS of a proton with chemical shift of 2 ppm is ...............

Hint:

In NMR, ppm × MHz directly gives frequency difference in Hz.

Answer 1

Correct Answer: 700

Step 1: Use the formula for converting ppm to Hz.
Chemical shift in Hz = (chemical shift in ppm) × (spectrometer frequency in MHz).
Step 2: Substitute values.
Chemical shift = 2 ppm.
Operating frequency = 350 MHz.
Thus, shift = 2 × 350 = 700 Hz.
Step 3: Conclusion.
Therefore, the resonance is shifted by 700 Hz from TMS.