Chapter 13: Q44P (page 611)

Rank the following compounds in order of increasing $λ_{\max}$

Short Answer

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The value of $λ_{\max}$ increases as the number of double bonds increases. In a $π \to π^{*}$ transition, the electron gets promoted from the HOMO to LUMO. Conjugation increases the energy of HOMO and decreases the energy of LUMO.

Step by step solution

Step-by-step-solutionStep 1: Effect of conjugation on λmax

Ranking the compounds in the order of increasing λmax

The compound C has a conjugated double bond when compared with other molecules like A, B and D. The compound with more number of conjugated double bonds will have a higher $λ_{max}$ value. The carbon-carbon (-C=C-) transition from the HOMO to LUMO, raises the energy of HOMO and lowers the energy of LUMO. The $λ_{max}$ value of the compounds in the increasing order can be given as:

role="math" localid="1652419263320" $λ_{max}$ value of the compounds in the increasing order

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Rank the following compounds in order of increasing $λ_{\max}$

Short Answer

Step by step solution

Step-by-step-solutionStep 1: Effect of conjugation on λmax

Ranking the compounds in the order of increasing λmax

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Rank the following compounds in order of increasingλmax

Short Answer

Step by step solution

Step-by-step-solutionStep 1: Effect of conjugation on λmax

Ranking the compounds in the order of increasing λmax

One App. One Place for Learning.

Most popular questions from this chapter

Recommended explanations on Chemistry Textbooks

Ionic and Molecular Compounds

Making Measurements

Physical Chemistry

Chemistry Branches

Chemical Reactions

The Earths Atmosphere

Study anywhere. Anytime. Across all devices.

Rank the following compounds in order of increasing $λ_{\max}$