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What does an intramolecular hydrogen bond do to a hydroxyl band?

  • A.Sharpens it at all concentrations
  • B.Removes it from the spectrum entirely
  • C.Splits it into two separate components
  • D.Lowers and broadens it regardless of dilution

Answer: D

An internal hydrogen bond cannot be broken by dilution, so the band stays low and broad where an intermolecular one would sharpen and rise. It does not disappear or split. That dilution distinguishes the two kinds of hydrogen bonding is a clean experiment: change one variable and see whether the observation responds, which is the general shape of every assignment in this topic.

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