MCAT Organic Chemistry Question 156: Answer and Explanation

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Question: 156

6. In 1H–NMR, splitting of spectral lines is due to:

  • A. coupling between a carbon atom and protons attached to that carbon atom.
  • B. coupling between a carbon atom and protons attached to adjacent carbon atoms.
  • C. coupling between adjacent carbon atoms.
  • D. coupling between protons on adjacent carbon atoms.

Correct Answer: D

Explanation:

Spin–spin coupling (splitting) is due to influence on the magnetic environment of one proton by protons on the adjacent atom. These protons are three bonds away from each other. Splitting in other NMR spectra can include coupling with carbon atoms, but not in 1H–NMR.

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