Question

1. What is the essential condition for NMR active nucleus?
(a) Odd mass number
(b) Even mass number
(c) Both a and b
(d) None of the above​

Answer 1

Answer:

NMR occurs due to the absorbance of radio frequency radiation to cause the "flipping" of nuclear spins from low to high energy spin states. While not all nuclei are NMR active (e.g. 12C and 16O are inactive), the most important nuclei for organic chemists are 1H and 13C (both with nuclear spin = 1/2).

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Answer 2

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Option (b)✔✔

➡The spin of atomic nuclei can be predicted based on the knowing the number of protons and neutrons in the nucleus: Even/Even. Nuclei that contain an even numbers of protons and an even number of neutrons have I=0 and are NMR silent.