Discussion
Statement I: A nucleus with I = 0 gives no NMR signal.
Statement II: Carbon-12 and oxygen-16 both have I = 0.
In the light of the above statements, choose the correct answer.
Answer: B
Both statements hold. Zero spin means no nuclear magnetic moment and so no Zeeman levels to move between, and the two commonest isotopes of carbon and oxygen are exactly of that kind. The consequence is that organic NMR of carbon rests on the 1.1 per cent carbon-13, and that oxygen work uses the scarce oxygen-17 or is not attempted at all. Nuclei with an even number of both protons and neutrons are the ones that come out at I = 0, which is a useful rule for predicting which isotopes will be silent.
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