4. Infrared spectroscopy is useful for determining certain aspects of the structure oforganic molecules because (3%)
(A) all molecular bonds absorb IR radiation.
(B) IR peak intensities are related to atomic number and molecular mass.
(C) most organic functional groups absorb in a characteristic region of the IRspectrum.
(D) vibrational transitions are correlated to spin-spin coupling.
(E) all of the above.
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