Why trans-penta-1, 3-diene absorbs at a much longer wavelength than penta-1, 4-diene even though both have a total of four π MOs is to be explained. Concept introduction: The λ max for the longest wavelength absorption in the UV-vis spectrum depends on the extent of conjugation. It increases with increasing conjugation though the difference decreases steadily with the extent of conjugation. Since this is directly related to the HOMO-LUMO energy difference, it implies that the energy difference also decreases as the extent of conjugation increases.

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Answer 1

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Chapter 15, Problem 15.8P

Interpretation Introduction

Interpretation:

Why $trans-penta-1, 3-diene$ absorbs at a much longer wavelength than $penta-1, 4-diene$ even though both have a total of four $π$ MOs is to be explained.

Concept introduction:

The $λmax$ for the longest wavelength absorption in the UV-vis spectrum depends on the extent of conjugation. It increases with increasing conjugation though the difference decreases steadily with the extent of conjugation. Since this is directly related to the HOMO-LUMO energy difference, it implies that the energy difference also decreases as the extent of conjugation increases.

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Answer 2

Question

Chapter 15, Problem 15.8P

Interpretation Introduction

Interpretation:

Why $trans-penta-1, 3-diene$ absorbs at a much longer wavelength than $penta-1, 4-diene$ even though both have a total of four $π$ MOs is to be explained.

Concept introduction:

The $λmax$ for the longest wavelength absorption in the UV-vis spectrum depends on the extent of conjugation. It increases with increasing conjugation though the difference decreases steadily with the extent of conjugation. Since this is directly related to the HOMO-LUMO energy difference, it implies that the energy difference also decreases as the extent of conjugation increases.

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Answer 3

Question

Chapter 15, Problem 15.8P

Interpretation Introduction

Interpretation:

Why $trans-penta-1, 3-diene$ absorbs at a much longer wavelength than $penta-1, 4-diene$ even though both have a total of four $π$ MOs is to be explained.

Concept introduction:

The $λmax$ for the longest wavelength absorption in the UV-vis spectrum depends on the extent of conjugation. It increases with increasing conjugation though the difference decreases steadily with the extent of conjugation. Since this is directly related to the HOMO-LUMO energy difference, it implies that the energy difference also decreases as the extent of conjugation increases.

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Answer 4

Question

Chapter 15, Problem 15.8P

Interpretation Introduction

Interpretation:

Why $trans-penta-1, 3-diene$ absorbs at a much longer wavelength than $penta-1, 4-diene$ even though both have a total of four $π$ MOs is to be explained.

Concept introduction:

The $λmax$ for the longest wavelength absorption in the UV-vis spectrum depends on the extent of conjugation. It increases with increasing conjugation though the difference decreases steadily with the extent of conjugation. Since this is directly related to the HOMO-LUMO energy difference, it implies that the energy difference also decreases as the extent of conjugation increases.

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Answer 5

Chapter 15, Problem 15.8P

Interpretation Introduction

Interpretation:

Why $trans-penta-1, 3-diene$ absorbs at a much longer wavelength than $penta-1, 4-diene$ even though both have a total of four $π$ MOs is to be explained.

Concept introduction:

The $λmax$ for the longest wavelength absorption in the UV-vis spectrum depends on the extent of conjugation. It increases with increasing conjugation though the difference decreases steadily with the extent of conjugation. Since this is directly related to the HOMO-LUMO energy difference, it implies that the energy difference also decreases as the extent of conjugation increases.

Answer 6

Chapter 15, Problem 15.8P

Interpretation Introduction

Interpretation:

Why $trans-penta-1, 3-diene$ absorbs at a much longer wavelength than $penta-1, 4-diene$ even though both have a total of four $π$ MOs is to be explained.

Concept introduction:

The $λmax$ for the longest wavelength absorption in the UV-vis spectrum depends on the extent of conjugation. It increases with increasing conjugation though the difference decreases steadily with the extent of conjugation. Since this is directly related to the HOMO-LUMO energy difference, it implies that the energy difference also decreases as the extent of conjugation increases.

Answer 7

Chapter 15, Problem 15.8P

Interpretation Introduction

Interpretation:

Why $trans-penta-1, 3-diene$ absorbs at a much longer wavelength than $penta-1, 4-diene$ even though both have a total of four $π$ MOs is to be explained.

Concept introduction:

The $λmax$ for the longest wavelength absorption in the UV-vis spectrum depends on the extent of conjugation. It increases with increasing conjugation though the difference decreases steadily with the extent of conjugation. Since this is directly related to the HOMO-LUMO energy difference, it implies that the energy difference also decreases as the extent of conjugation increases.

Answer 8

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Answer 9

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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 why trans-penta-1, 3-diene absorbs at a longer wavelength than

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