Q90 · CSIR-NET Chemistry, June 2015

Paper: CSIR-NET June 2015 · Subject: Physical Chemistry · Chapter: Molecular Spectroscopy · Topic: Molecular Spectroscopy – General · Marks: 2 · Difficulty: Medium

The nuclear g-factors of ${ }_{1} \mathrm{H}$ and ${ }_{14} \mathrm{N}$ are 5.6 and 0.40 respectively. If the magnetic field in an NMR spectrometer is set such that the proton resonates at 700 MHz , the ${ }_{14} \mathrm{N}$ nucleus would resonate at
(a)1750 MHz
(b)700 MHz
(c)125 MHz
(d)50 MHz
Answer
Answer: D ✓ checked by 4AB · confidence high
Explanation
ν ∝ g_N at fixed field: 700 × 0.40/5.6 = 50 MHz.

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