TPR Complete 1

[basophilic]

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1H NMR spectroscopy can provide all of the following information EXCEPT:
A) the connectivity of atoms in a molecule.
B) the number of nonequivalent hydrogens in a molecule.
C) the chemical environment of the hydrogen atoms in a molecule.
D) the identity of functional groups in a compound.



Answer is D. TPR says that NMR can't conclusively determine functional groups and only IR is better than that. I thought answer was A because NMR doesn’t "conclusively" determine the connections between atoms either - you indirectly determine that just like you indirectly infer the functional group by observing the spectrum. Also, IR would be better for determining the connectivities of atoms, no?

 

[dahmsom]

I would chose D AS WELL. Because you can determine the connectivity based on the split pattern. Let's say you have a triplet and 2 hydrogens. You know that you have a ch2 groups next to four hydrogens . You can see the connectivity

 

[basophilic]

I would chose D AS WELL. Because you can determine the connectivity based on the split pattern. Let's say you have a triplet and 2 hydrogens. You know that you have a ch2 groups next to four hydrogens . You can see the connectivity

But you can also argue similarly that if I see a specific splitting pattern (7-8 for aryl H's, 9-10 for aldehyde, 0-2 for alkyl, etc.) I can ultimately infer the identity of functional group.