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Questions and Answers
Which electronic transition requires the highest amount of energy?
Which electronic transition requires the highest amount of energy?
- π to π* transition
- σ to σ* transition (correct)
- n to π* transition
- n to σ* transition
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?
- Propyne
- Ethene
- Ethanol (correct)
- Methane
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?
- σ to σ* transition
- n to π* transition (correct)
- n to σ* transition
- 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?
Which compounds are likely to undergo n to π* transitions?
Which compounds are likely to undergo n to π* transitions?
Flashcards
σ to σ* transition
σ to σ* transition
An electronic transition where an electron moves from a sigma bonding orbital to a sigma antibonding orbital. This requires a high energy input.
n to σ* transition
n to σ* transition
An electronic transition where an electron moves from a non-bonding orbital (lone pair) to a sigma antibonding orbital. This requires a moderate amount of energy.
n to π* transition
n to π* transition
An electronic transition where an electron moves from a non-bonding orbital (lone pair) to a pi antibonding orbital. This requires less energy than σ to σ* transitions.
π to π* transition
π to π* transition
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UV-Vis Spectroscopy
UV-Vis Spectroscopy
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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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