What kind of electron transition, in propenal, does the absorption at 202 nm correspond to is to be explained. Concept introduction: In UV–vis. spectroscopy, absorption of a photon promotes an electron from a lower energy MO to a higher-energy MO. λ max for the longest-wavelength (lowest-energy) absorption in the spectrum generally corresponds to the HOMO–LUMO transition. In a π → π* transition, an electron from a π MO is promoted to a π* MO. In an n → π* transition, an electron from a nonbonding MO is promoted to a π* MO. Conjugation decreases the energy difference between the HOMO and LUMO, and thus increases the wavelength of the photons absorbed.

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Chapter 15, Problem 15.37P

Interpretation Introduction

Interpretation:

What kind of electron transition, in propenal, does the absorption at 202 nm correspond to is to be explained.

Concept introduction:

In UV–vis. spectroscopy, absorption of a photon promotes an electron from a lower energy MO to a higher-energy MO. λmax for the longest-wavelength (lowest-energy) absorption in the spectrum generally corresponds to the HOMO–LUMO transition. In a π→π* transition, an electron from a π MO is promoted to a π* MO. In an n→π* transition, an electron from a nonbonding MO is promoted to a π* MO. Conjugation decreases the energy difference between the HOMO and LUMO, and thus increases the wavelength of the photons absorbed.

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Answer 2

Question

Chapter 15, Problem 15.37P

Interpretation Introduction

Interpretation:

What kind of electron transition, in propenal, does the absorption at 202 nm correspond to is to be explained.

Concept introduction:

In UV–vis. spectroscopy, absorption of a photon promotes an electron from a lower energy MO to a higher-energy MO. λmax for the longest-wavelength (lowest-energy) absorption in the spectrum generally corresponds to the HOMO–LUMO transition. In a π→π* transition, an electron from a π MO is promoted to a π* MO. In an n→π* transition, an electron from a nonbonding MO is promoted to a π* MO. Conjugation decreases the energy difference between the HOMO and LUMO, and thus increases the wavelength of the photons absorbed.

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Answer 3

Question

Chapter 15, Problem 15.37P

Interpretation Introduction

Interpretation:

What kind of electron transition, in propenal, does the absorption at 202 nm correspond to is to be explained.

Concept introduction:

In UV–vis. spectroscopy, absorption of a photon promotes an electron from a lower energy MO to a higher-energy MO. λmax for the longest-wavelength (lowest-energy) absorption in the spectrum generally corresponds to the HOMO–LUMO transition. In a π→π* transition, an electron from a π MO is promoted to a π* MO. In an n→π* transition, an electron from a nonbonding MO is promoted to a π* MO. Conjugation decreases the energy difference between the HOMO and LUMO, and thus increases the wavelength of the photons absorbed.

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Answer 4

Question

Chapter 15, Problem 15.37P

Interpretation Introduction

Interpretation:

What kind of electron transition, in propenal, does the absorption at 202 nm correspond to is to be explained.

Concept introduction:

In UV–vis. spectroscopy, absorption of a photon promotes an electron from a lower energy MO to a higher-energy MO. λmax for the longest-wavelength (lowest-energy) absorption in the spectrum generally corresponds to the HOMO–LUMO transition. In a π→π* transition, an electron from a π MO is promoted to a π* MO. In an n→π* transition, an electron from a nonbonding MO is promoted to a π* MO. Conjugation decreases the energy difference between the HOMO and LUMO, and thus increases the wavelength of the photons absorbed.

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Answer 5

Chapter 15, Problem 15.37P

Interpretation Introduction

Interpretation:

What kind of electron transition, in propenal, does the absorption at 202 nm correspond to is to be explained.

Concept introduction:

In UV–vis. spectroscopy, absorption of a photon promotes an electron from a lower energy MO to a higher-energy MO. λmax for the longest-wavelength (lowest-energy) absorption in the spectrum generally corresponds to the HOMO–LUMO transition. In a π→π* transition, an electron from a π MO is promoted to a π* MO. In an n→π* transition, an electron from a nonbonding MO is promoted to a π* MO. Conjugation decreases the energy difference between the HOMO and LUMO, and thus increases the wavelength of the photons absorbed.

Answer 6

Chapter 15, Problem 15.37P

Interpretation Introduction

Interpretation:

What kind of electron transition, in propenal, does the absorption at 202 nm correspond to is to be explained.

Concept introduction:

In UV–vis. spectroscopy, absorption of a photon promotes an electron from a lower energy MO to a higher-energy MO. λmax for the longest-wavelength (lowest-energy) absorption in the spectrum generally corresponds to the HOMO–LUMO transition. In a π→π* transition, an electron from a π MO is promoted to a π* MO. In an n→π* transition, an electron from a nonbonding MO is promoted to a π* MO. Conjugation decreases the energy difference between the HOMO and LUMO, and thus increases the wavelength of the photons absorbed.

Answer 7

Chapter 15, Problem 15.37P

Interpretation Introduction

Interpretation:

What kind of electron transition, in propenal, does the absorption at 202 nm correspond to is to be explained.

Concept introduction:

In UV–vis. spectroscopy, absorption of a photon promotes an electron from a lower energy MO to a higher-energy MO. λmax for the longest-wavelength (lowest-energy) absorption in the spectrum generally corresponds to the HOMO–LUMO transition. In a π→π* transition, an electron from a π MO is promoted to a π* MO. In an n→π* transition, an electron from a nonbonding MO is promoted to a π* MO. Conjugation decreases the energy difference between the HOMO and LUMO, and thus increases the wavelength of the photons absorbed.

Answer 8

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Answer 10

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Answer 11

Ch. 15 - Prob. 15.1P Ch. 15 - Prob. 15.2P Ch. 15 - Prob. 15.3P Ch. 15 - Prob. 15.4P Ch. 15 - Prob. 15.5P Ch. 15 - Prob. 15.6P Ch. 15 - Prob. 15.7P Ch. 15 - Prob. 15.8P Ch. 15 - Prob. 15.9P Ch. 15 - Prob. 15.10P

Solution Summary: The author explains how the absorption at 202 nm corresponds to the HOMO–LUMO transition in UV–vis. spectroscopy.

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Chapter 15 Solutions