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Consider the following statements regarding NMR spectroscopy. Determine whether each each statement is true or false.
a. Spin-spin splitting can occur over many bond lengths in a molecule.
b. NMR spectroscopy requires a nucleus having non-zero electron spin.
c. Shielding occurs when electrons near a proton are induced to circulate by the applied field. This electron field opposes the applied field.
d. A typical value for the chemical shift of aromatic protons is 7.5.