Podcast
Questions and Answers
Which electronic transition requires the highest amount of energy?
Which electronic transition requires the highest amount of energy?
Which of the following compounds is likely to undergo an n to σ* transition?
Which of the following compounds is likely to undergo an n to σ* transition?
In which type of transition is less energy required than for the π to π* transition?
In which type of transition is less energy required than for the π to π* transition?
Which of the following correctly describes a π to π* transition?
Which of the following correctly describes a π to π* transition?
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Which compounds are likely to undergo n to π* transitions?
Which compounds are likely to undergo n to π* transitions?
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Study Notes
UV-Visible Light Absorption and Electronic Transitions
- Four types of electronic transitions can occur when a molecule absorbs UV-Visible light.
σ to σ* Transition
- Requires a high energy input.
- Found in saturated hydrocarbons (e.g., methane, propane).
n to σ* Transition
- Involves molecules with lone pairs of electrons.
- Examples include alcohols, ethers, aldehydes, and ketones.
n to π* Transition
- Requires less energy than σ to σ* transition.
- Occurs in molecules with double or triple bonds.
- Examples include saturated aldehydes.
π to π* Transition
- Happens in unsaturated molecules and aromatic compounds.
- Needs slightly more energy than n to π* transition.
- Examples include ethene, ethyne, alkenes, alkynes.
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Description
Explore the four types of electronic transitions that occur during UV-Visible light absorption in molecules. This quiz covers σ to σ*, n to σ*, n to π*, and π to π* transitions, highlighting the energy requirements and examples of each type. Test your understanding of how these transitions apply to various organic compounds.
