Worksheet: Electronic Transitions in UV–Vis Spectra

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

Q2:

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

  • ARo-vibrational transition
  • BRotational transition
  • CVibrational transition
  • DElectronic 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 H B r ?

  • AVibrational transition
  • BRotational transition
  • CTranslational transition
  • DElectronic transition

Q4:

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

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

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