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Discussion

Absorption in the ultraviolet and visible region excites

  • A.nuclear spin transitions
  • B.electronic transitions
  • C.molecular vibrations
  • D.molecular rotations

Answer: B

Photons of a few electronvolts promote an electron from a bonding or non-bonding orbital to an antibonding one. Vibrational and rotational changes accompany the electronic jump, which is why the bands are broad rather than sharp lines.

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