b) Consider the following statements, and circle True or False as appropriate. A

Question

b) Consider the following statements, and circle True or False as appropriate. An aldehydic carbon (C=O) appears at ~200 ppm in the 13C NMR spectrum. True/False Diastereotopic protons are always equivalent. True/False A proton attached to a carbon would appear as a doublet in the 'H NMR spectrum if there was a neighbouring CH3 group. True/False There is more chance of overlapping signals in a H NMR spectrum at higher field strengths. True/False Coupling constants (J values) do not vary with field strength in an NMR spectrum. True/False

Explanation / Answer

Yes Aldehyde carbon appears at 190-200 ppm in the C NMR spectroscopy (True)

Diastereotopic protons will always have different chemical shifts in all situations. They are not equivalent (False)

False

Yes there is more chance of overlapping in H NMR spectroscopy at high field strengths. (true)

Yes coupling constants do not vary with field strength in an NMR spectroscopy. (true)

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