In the following mass spectrum, which element should be presented in the molecul

Question

In the following mass spectrum, which element should be presented in the molecule? a) Bromine b) Chlorine c) Iodine d) Nitrogen e) Sulfur How many different NMR signals produced from 2, 2-dimethylbutane in^13 C NMR? a) 4 signals b) 3 signals c) 2 signals d) 3 signals Which radiation is higher in energy relatively? a) microwave b) visible c) radio-wave d) infrared Spin-Spin splitting is used for finding some information about a) number of hydrogen contributing to that peak in^1H NMR b) number of hydrogen contributing to the neighboring^13C NMR c) number of hydrogen which has a three-bond distance to that peak in^H NMR d) number of hydrogen which is closed in the space, not through the bonds in^1H NMR

Explanation / Answer

8. Given Mass spectrum has,

a) Bromine

1 : 1 ratio of M+ = 156 and M+2 = 158

9. Number of signals for 2,2-dimethylbutane in 13C NMR would be,

a) 4 signals

10. Higher energy radiation is,

b) Visible

11. spin-spin splitting is used for finding information about,

d)

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