Question:
Which of the following nucleus/nuclei is/are NMR active?
Which of the following nucleus/nuclei is/are NMR active?
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Rule: Odd mass number or odd atomic number nuclei usually have non-zero spin → NMR active.
Updated On: Jan 2, 2026
- $^1\mathrm{H}$
- $^{13}\mathrm{C}$
- $^{16}\mathrm{O}$
- $^{32}\mathrm{S}$
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The Correct Option is A, B
Solution and Explanation
A nucleus is NMR active if its nuclear spin quantum number $I \neq 0$.
- $^1$H has $I = \frac{1}{2}$ → NMR active.
- $^{13}$C has $I = \frac{1}{2}$ → NMR active.
- $^{16}$O has $I = 0$ → NMR inactive.
- $^{32}$S has $I = 0$ → NMR inactive.
Thus, only $^1$H and $^{13}$C are NMR active.
- $^1$H has $I = \frac{1}{2}$ → NMR active.
- $^{13}$C has $I = \frac{1}{2}$ → NMR active.
- $^{16}$O has $I = 0$ → NMR inactive.
- $^{32}$S has $I = 0$ → NMR inactive.
Thus, only $^1$H and $^{13}$C are NMR active.
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