Worksheet: Electronic Transitions in UV–Vis Spectra

In this worksheet, we will practice assigning UV–vis signals to electronic transitions and explaining the shapes of absorption and emission bands.

Q1:

Which of the following typically exhibits the largest molar absorptivities?

  • A 𝜎 β†’ 𝜎 βˆ— absorbances
  • BMetal-to-ligand charge-transfer (MLCT) absorbances
  • C πœ‹ β†’ πœ‹ βˆ— absorbances
  • D 𝜎 β†’ 𝑛 absorbances
  • E 𝜎 β†’ πœ‹ βˆ— βˆ— absorbances

Q2:

For which of the following transitions is the frequency of light absorption the highest for a heteronuclear diatomic molecule like HBr?

  • AElectronic transition
  • BRo-vibrational transition
  • CRotational transition
  • DVibrational transition

Q3:

For which of the following transitions does the frequency of light absorption occur in the UV–vis region for a heteronuclear diatomic molecule like HBr?

  • ARotational transition
  • BTranslational transition
  • CElectronic transition
  • DVibrational transition

Q4:

Which of the following transitions is not possible in UV–vis absorption?

  • A 𝜎 β†’ πœ‹ βˆ—
  • B 𝜎 β†’ 𝜎 βˆ—
  • C 𝑛 β†’ πœ‹ βˆ—
  • D 𝜎 β†’ 𝑛

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