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The absorption at λmax 279 nm (ε = 15) in the UV spectrum of acetone is due to:
- a)π-π* transition
- b)σ-σ* transition
- c)n-π* transition
- d)π-σ* transition
Correct answer is option 'C'. Can you explain this answer?
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Most Upvoted Answer
The absorption at λmax 279 nm (ε = 15) in the UV spectr...
UV spectrum of Acetone:
UV spectroscopy is a technique used to determine the structure of a compound by analyzing its absorption of ultraviolet radiation. Acetone is a colorless liquid and has a strong absorption in the UV region of the spectrum.
Explanation:
The absorption at max 279 nm (= 15) in the UV spectrum of acetone is due to the pi to pi* transition.
- Pi electrons are the electrons present in the pi bond of a molecule.
- Pi to pi* transition refers to the excitation of an electron from the pi bonding orbital to the pi* antibonding orbital.
- The energy required for this transition corresponds to the wavelength of light absorbed.
- In acetone, the pi electrons in the carbonyl group undergo pi to pi* transition, which results in the absorption at max 279 nm in the UV spectrum.
Conclusion:
The absorption at max 279 nm in the UV spectrum of acetone is due to the pi to pi* transition. This transition results from the excitation of an electron from the pi bonding orbital to the pi* antibonding orbital present in the carbonyl group of acetone.
UV spectroscopy is a technique used to determine the structure of a compound by analyzing its absorption of ultraviolet radiation. Acetone is a colorless liquid and has a strong absorption in the UV region of the spectrum.
Explanation:
The absorption at max 279 nm (= 15) in the UV spectrum of acetone is due to the pi to pi* transition.
- Pi electrons are the electrons present in the pi bond of a molecule.
- Pi to pi* transition refers to the excitation of an electron from the pi bonding orbital to the pi* antibonding orbital.
- The energy required for this transition corresponds to the wavelength of light absorbed.
- In acetone, the pi electrons in the carbonyl group undergo pi to pi* transition, which results in the absorption at max 279 nm in the UV spectrum.
Conclusion:
The absorption at max 279 nm in the UV spectrum of acetone is due to the pi to pi* transition. This transition results from the excitation of an electron from the pi bonding orbital to the pi* antibonding orbital present in the carbonyl group of acetone.
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The absorption at λmax 279 nm (ε = 15) in the UV spectr...
The type of transition is responsible for a band at λmax = 279 nm in absorption spectrum of acetone. In case of n → π* transitions, the polar solvents form hydrogen bonds with the ground state of polar molecules more readily than with their excited states. Therefore, in polar solvents the energies of electronic transitions are increased.
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The absorption at λmax 279 nm (ε = 15) in the UV spectrum of acetone is due to:a)π-π* transitionb)σ-σ* transitionc)n-π* transitiond)π-σ* transitionCorrect answer is option 'C'. Can you explain this answer?
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