H-NMR Question

[fuqele]

Hey guys,

I had this question on Achiever that asked about proton NMR. In the answer key, it basically says that the ring protons of p-xylene would appear as singlet even though they do have neighbors. Why is that? I don't think I quite understand its explanation.

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[AlbinoPolarBear]

Hey guys,

I had this question on Achiever that asked about proton NMR. In the answer key, it basically says that the ring protons of p-xylene would appear as singlet even though they do have neighbors. Why is that? I don't think I quite understand its explanation.

Protons will only couple to other protons that are different from them.

In p-xylene, all of the ring protons are in the identical environment, making them magnetically equivalent. Thus, not being able to couple to split the signal.

 

[Dotoday]

P-xylene has symmetry. Symmetrical protons are considered equivalent and they do not split. Hope this helps. Good luck.

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