The ¹ H NMR frequency at 1.0T is 42.4 MHz. If the gyromagnetic ratios of ¹ H and ¹³ C are 27 × 10⁷ and 6.75 × 10⁷ T⁻¹ S⁻¹ respectively, what will be the ₁₃ C frequency at 1.0 T ?

(a) 10.6 MHz. Explanation: ν ∝ γ: 42.4 × 6.75/27 = 10.6 MHz.

Q111 · CSIR-NET Chemistry, December 2015

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

The ${ }^{1} \mathrm{H} \mathrm{NMR}$ frequency at 1.0T is 42.4 MHz. If the gyromagnetic ratios of ${ }^{1} \mathrm{H}$ and ${ }^{13} \mathrm{C}$ are $27 \times 10^{7}$ and $6.75 \times 10^{7} \mathrm{T}^{-1} \mathrm{S}^{-1}$ respectively, what will be the ${ }_{13} \mathrm{C}$ frequency at 1.0 T ?

(a)10.6 MHz

(b)169.6 MHz

(c)42.6 MHz

(d)21.3 MHz

Answer

Answer: A ✓ checked by 4AB · confidence high

Explanation

ν ∝ γ: 42.4 × 6.75/27 = 10.6 MHz.

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