8. In the hydrogen nuclear magnetic resonance spectrum of CH3-CH2-COOH, one group of quartet and triplet can be observed. (1) Explain the causes of these peaks; (2) Which group of peaks is in the lower field? Why / solution: (1) Due to the spin coupling phenomenon between a-, b-protons, according to (n + 1 ) Regularly, the CH3-proton NMR peak is split into triplets by methylene protons. Similarly, methylene protons are split into quartets by neighboring methyl protons. (2) Since the a-position proton is more strongly induced by the carboxyl group than the b-proton, the methylene proton peak appears at a low field (quartet).
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