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Spin-spin splitting of a proton signal is caused by

  • A.shielding by the surrounding electrons
  • B.the applied field's inhomogeneity
  • C.exchange of the proton with the solvent
  • D.the spins of neighbouring non-equivalent protons

Answer: D

Coupling through the intervening bonds means each neighbour's two spin states shift the observed resonance slightly, splitting it into a multiplet. The separation, the coupling constant, is independent of the field strength.

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