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Resonance structures for the "allyl carbanion" are shown below (I and II). CH CH=CH2 CH=CH-CH2 I II Which of the following statements regarding I and Il are correct? Select one: O A. The energy of the actual allyl carbanion is higher than the energy expected for resonance structuresI and II. B. Resonance structures I and II are nonequivalent resonance structures. C. The actual structure of an allyl carbanion is an average of structures I and II, with both resonance structures weighted equally. D. In the actual allyl carbanion, both C,C bonds are unequal in length.

Resonance structures for the "allyl carbanion" are shown below (I and II). CH CH=CH2 CH=CH-CH2 I II Which of the following statements regarding I and Il are correct? Select one: O A. The energy of the actual allyl carbanion is higher than the energy expected for resonance structuresI and II. B. Resonance structures I and II are nonequivalent resonance structures. C. The actual structure of an allyl carbanion is an average of structures I and II, with both resonance structures weighted equally. D. In the actual allyl carbanion, both C,C bonds are unequal in length.

Chemistry
Chemistry
10th Edition
ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Chapter1: Chemical Foundations
Section: Chapter Questions
Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
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**Resonance Structures for the Allyl Carbanion** The resonance structures for the "allyl carbanion" are illustrated below (I and II): - Structure I: CH₂=CH–CH₂⁻ - Structure II: ⁻CH₂–CH=CH₂ **Question:** Which of the following statements regarding I and II are correct? **Options:** A. The energy of the actual allyl carbanion is higher than the energy expected for resonance structures I and II. B. Resonance structures I and II are nonequivalent resonance structures. C. *The actual structure of an allyl carbanion is an average of structures I and II, with both resonance structures weighted equally.* D. In the actual allyl carbanion, both C,C bonds are unequal in length. **Correct Answer:** C **Explanation of Diagrams:** The diagrams represent two resonance forms of the allyl carbanion, showing the movement of electrons. Structure I has a negative charge localized on the terminal carbon, while in structure II, the negative charge is on the opposite terminal carbon. The double bonds and single bonds shift positions between the two structures to stabilize the negative charge.
Transcribed Image Text:**Resonance Structures for the Allyl Carbanion** The resonance structures for the "allyl carbanion" are illustrated below (I and II): - Structure I: CH₂=CH–CH₂⁻ - Structure II: ⁻CH₂–CH=CH₂ **Question:** Which of the following statements regarding I and II are correct? **Options:** A. The energy of the actual allyl carbanion is higher than the energy expected for resonance structures I and II. B. Resonance structures I and II are nonequivalent resonance structures. C. *The actual structure of an allyl carbanion is an average of structures I and II, with both resonance structures weighted equally.* D. In the actual allyl carbanion, both C,C bonds are unequal in length. **Correct Answer:** C **Explanation of Diagrams:** The diagrams represent two resonance forms of the allyl carbanion, showing the movement of electrons. Structure I has a negative charge localized on the terminal carbon, while in structure II, the negative charge is on the opposite terminal carbon. The double bonds and single bonds shift positions between the two structures to stabilize the negative charge.
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