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There are two possible chair conformations of cis-1-ethyl-4-bromocyclohexane. What is the energy difference between the two chair conformations? 5.6kJ/mol 6.0kJ/mol 9.6kJ/mol 2.8kJ/mol

There are two possible chair conformations of cis-1-ethyl-4-bromocyclohexane. What is the energy difference between the two chair conformations? 5.6kJ/mol 6.0kJ/mol 9.6kJ/mol 2.8kJ/mol

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ISBN:9781305957404
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There are two possible chair conformations of cis-1-ethyl-4-bromocyclohexane. What is the energy difference between the two chair conformations?

5.6kJ/mol

6.0kJ/mol

9.6kJ/mol

2.8kJ/mol

 

### 1,3-Diaxial Strain Energy #### Description: The table below presents strain energy values associated with 1,3-diaxial interactions for various substituents (X) on a cyclohexane ring. The values are given in both kcal/mol and kJ/mol. #### Diagram: - The diagram above the table illustrates a cyclohexane ring in a chair conformation. It highlights the axial positions with X and H atoms, showing the 1,3-diaxial interactions between them. #### Table of 1,3-Diaxial Strain Energy: | X | kCal/mol | kJ/mol | |----------|----------|--------| | CN | 0.11 | 0.4 | | F | 0.12 | 0.5 | | Cl | 0.25 | 1.0 | | Br | 0.25 | 1.0 | | OH | 0.50 | 2.1 | | CO₂H | 0.70 | 2.9 | | CH₃ | 0.90 | 3.8 | | CH₂(CH₃) | 0.95 | 4.0 | | CH(CH₃)₂ | 1.1 | 4.6 | | CH₂CH₃ | 1.5 | 6.3 | | C(CH₃)₃ | 2.7 | 11.4 | #### Explanation: - The table highlights how different substituents can affect the strain energy due to steric interactions when they are positioned in the axial orientation on a cyclohexane ring. Smaller groups like CN and F have minimal strain energy, whereas larger, bulkier groups like C(CH₃)₃ experience significantly higher strain energy due to increased steric hindrance.
Transcribed Image Text:### 1,3-Diaxial Strain Energy #### Description: The table below presents strain energy values associated with 1,3-diaxial interactions for various substituents (X) on a cyclohexane ring. The values are given in both kcal/mol and kJ/mol. #### Diagram: - The diagram above the table illustrates a cyclohexane ring in a chair conformation. It highlights the axial positions with X and H atoms, showing the 1,3-diaxial interactions between them. #### Table of 1,3-Diaxial Strain Energy: | X | kCal/mol | kJ/mol | |----------|----------|--------| | CN | 0.11 | 0.4 | | F | 0.12 | 0.5 | | Cl | 0.25 | 1.0 | | Br | 0.25 | 1.0 | | OH | 0.50 | 2.1 | | CO₂H | 0.70 | 2.9 | | CH₃ | 0.90 | 3.8 | | CH₂(CH₃) | 0.95 | 4.0 | | CH(CH₃)₂ | 1.1 | 4.6 | | CH₂CH₃ | 1.5 | 6.3 | | C(CH₃)₃ | 2.7 | 11.4 | #### Explanation: - The table highlights how different substituents can affect the strain energy due to steric interactions when they are positioned in the axial orientation on a cyclohexane ring. Smaller groups like CN and F have minimal strain energy, whereas larger, bulkier groups like C(CH₃)₃ experience significantly higher strain energy due to increased steric hindrance.
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