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Which of the following chair conformations is the most stable? H H A H Tu B A A and B have the same stability. B A is more stable than B if the solvent is polar protic. B is more stable than A if the solvent is polar aprotic.

Which of the following chair conformations is the most stable? H H A H Tu B A A and B have the same stability. B A is more stable than B if the solvent is polar protic. B is more stable than A if the solvent is polar aprotic.

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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### Chair Conformations Stability Assessment **Question:** Which of the following chair conformations is the most stable? **Diagram:** - There are two chair conformations labeled as A and B. #### Conformation A: - A chair conformation with specific hydrogen atoms marked. #### Conformation B: - Another chair conformation similar to A but with the hydrogens arranged differently. **Options:** - ○ A - ○ A and B have the same stability. - ○ B - ○ A is more stable than B if the solvent is polar protic. B is more stable than A if the solvent is polar aprotic. When considering the stability of chair conformations, it's essential to analyze the spatial arrangement of substituents (hydrogen atoms in this case) and their interactions. The chair form will generally be more stable if bulky groups are in equatorial positions to minimize steric hindrance. This question assesses understanding of the factors influencing the stability of cyclohexane chair conformations, including steric and electronic effects, and how the solvent environment can play a role in stability.
Transcribed Image Text:### Chair Conformations Stability Assessment **Question:** Which of the following chair conformations is the most stable? **Diagram:** - There are two chair conformations labeled as A and B. #### Conformation A: - A chair conformation with specific hydrogen atoms marked. #### Conformation B: - Another chair conformation similar to A but with the hydrogens arranged differently. **Options:** - ○ A - ○ A and B have the same stability. - ○ B - ○ A is more stable than B if the solvent is polar protic. B is more stable than A if the solvent is polar aprotic. When considering the stability of chair conformations, it's essential to analyze the spatial arrangement of substituents (hydrogen atoms in this case) and their interactions. The chair form will generally be more stable if bulky groups are in equatorial positions to minimize steric hindrance. This question assesses understanding of the factors influencing the stability of cyclohexane chair conformations, including steric and electronic effects, and how the solvent environment can play a role in stability.
**Understanding Resonance Structures in Chemistry** In this example, we will explore the resonance scheme depicted below. Your task is to select the correct statement from the given options. ### Resonance Structures The resonance structures of the molecule are labeled as A, B, and C. #### Diagram Breakdown - **Structure A**: Displays a neutral formal structure with lone pairs shown on the oxygen atom, contributing to the double bond with a carbon atom, and another hydrogen bonded to the carbon. - **Structure B**: Shows a double-headed arrow to indicate resonance with lone pairs on both the oxygen and nitrogen atoms, alongside curved arrows indicating electron flow. There is a missing negative charge on the nitrogen atom depicted here. - **Structure C**: Represents an alternate resonance form with lone pairs on the oxygen atom and no additional charges indicated. ### Answer Choices 1. **Structure B is missing a negative charge.** 2. **Structure A is missing a negative charge.** 3. **This mechanism is free of errors.** 4. **Structure C the charge on oxygen should be positive.** In identifying the correct answer, consider the role of charges in resonance structures and the proper representation of electron movement as well as formal charges on atoms. By closely examining each structure, you can improve your understanding of resonance in organic molecules and practice identifying errors or confirming correctness in resonance representations. Happy learning! --- Remember, resonance structures are a key concept in understanding the behavior and stability of molecules in chemistry. Use this example to sharpen your skills in recognizing and constructing accurate resonance forms.
Transcribed Image Text:**Understanding Resonance Structures in Chemistry** In this example, we will explore the resonance scheme depicted below. Your task is to select the correct statement from the given options. ### Resonance Structures The resonance structures of the molecule are labeled as A, B, and C. #### Diagram Breakdown - **Structure A**: Displays a neutral formal structure with lone pairs shown on the oxygen atom, contributing to the double bond with a carbon atom, and another hydrogen bonded to the carbon. - **Structure B**: Shows a double-headed arrow to indicate resonance with lone pairs on both the oxygen and nitrogen atoms, alongside curved arrows indicating electron flow. There is a missing negative charge on the nitrogen atom depicted here. - **Structure C**: Represents an alternate resonance form with lone pairs on the oxygen atom and no additional charges indicated. ### Answer Choices 1. **Structure B is missing a negative charge.** 2. **Structure A is missing a negative charge.** 3. **This mechanism is free of errors.** 4. **Structure C the charge on oxygen should be positive.** In identifying the correct answer, consider the role of charges in resonance structures and the proper representation of electron movement as well as formal charges on atoms. By closely examining each structure, you can improve your understanding of resonance in organic molecules and practice identifying errors or confirming correctness in resonance representations. Happy learning! --- Remember, resonance structures are a key concept in understanding the behavior and stability of molecules in chemistry. Use this example to sharpen your skills in recognizing and constructing accurate resonance forms.
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