MCAT Organic Chemistry Question 164: Answer and Explanation

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Question: 164

14. The coupling coefficient, J, is:

  • A. the value of n + 1 when determining splitting in NMR spectra.
  • B. measured in parts per million (ppm).
  • C. corrected for by calibration with tetramethylsilane.
  • D. a measure of the degree of splitting caused by other atoms in the molecule.

Correct Answer: D

Explanation:

The coupling constant is a measured of the degree of splitting introduced by other atoms in a molecule, and is the frequency of the distance between subpeaks. It is measured in hertz, eliminating choice (B). The coupling constant is independent of the value of n + 1, and is not changed by calibration with tetramethylsilane, eliminating choices (A) and (B).

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