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Compare your reasoning with the explanation given below:
- The methyl group in acetaldehyde can rotate almost
freely around around the C-C single bond. Therefore the methyl protons
are exposed to a shielding averaged over time.
- The methyl protons are equivalent if averaged over
the NMR time scale, and give only a single NMR signal.
Do you want a more detailed explanation of these points? Check page21!
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Considering what you have learned so far, would
you expect in a 1H-NMR-spektrum of
propionaldehyde CH3-CH2-CHO
at room temperature
3 signals?
4 signals?
6 signals?
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