Discussion
Why is carbon-13 far less sensitive than hydrogen-1 in NMR?
Answer: B
Two factors multiply together: carbon-13 is only 1.1 per cent of natural carbon, and its gyromagnetic ratio is about a quarter that of the proton. Sensitivity goes as the cube of the gyromagnetic ratio for a given field, so the combined penalty is roughly six thousand fold. Carbon-13 has I = 1/2 and so is certainly not silent, its relaxation is slow rather than fast, and its resonance sits comfortably in range. The remedy is many more scans, and the accumulation of signal is why a carbon spectrum takes minutes where a proton spectrum takes seconds.
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