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H NMR Table

H NMR Table

15. Analytical Techniques:IR, NMR, Mass Spect / H NMR Table / Problem 5

Which statement explains why the methine proton has a higher chemical shift than the methyl proton?

ANSWERS OPTIONS

A

Carbon has a higher atomic mass than hydrogen, so additional carbon atoms increase the deshielding effect felt by hydrogen.

B

Hyperconjugation between alkyl groups increases the deshielding effect felt by hydrogen.

C

Alkyl groups act as electron-donating groups, increasing the deshielding effect felt by hydrogen.

D

Carbon is more electronegative than hydrogen, so additional carbon atoms increase the deshielding effect felt by hydrogen.

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