Which of the following represents trans-1-ethyl-3-methylcyclohexane in its most stable conformation? H CH3 CH3 I III H CH₂CH3 CH₂CH3 CH3 CH3 II IV CH₂CH3 CH₂CH3

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**Question:**

Which of the following represents trans-1-ethyl-3-methylcyclohexane in its most stable conformation?

**Images:**

There are four structural representations of cyclohexane derivatives labeled I, II, III, and IV. Each structure depicts a cyclohexane ring with two substituents. The substituents are either in the axial or equatorial positions:

- **Structure I:** The cyclohexane ring has a CH₃ group and a CH₂CH₃ group. The CH₃ is axial, and the CH₂CH₃ is equatorial.

- **Structure II:** The cyclohexane ring has a CH₃ group and a CH₂CH₃ group. Both are equatorial.

- **Structure III:** The cyclohexane ring has a CH₃ group and a CH₂CH₃ group. The CH₃ is equatorial, and the CH₂CH₃ is axial.

- **Structure IV:** The cyclohexane ring has a CH₃ group and a CH₂CH₃ group. Both are axial.

**Options:**

Select one:
- A. I
- B. III
- C. II
- D. IV

**Explanation:**

To determine the most stable conformation for trans-1-ethyl-3-methylcyclohexane, consider the spatial orientation of substituents. The trans configuration requires one substituent to be axial and the other equatorial. Consider steric hindrance and energy minimization for stability.
Transcribed Image Text:**Question:** Which of the following represents trans-1-ethyl-3-methylcyclohexane in its most stable conformation? **Images:** There are four structural representations of cyclohexane derivatives labeled I, II, III, and IV. Each structure depicts a cyclohexane ring with two substituents. The substituents are either in the axial or equatorial positions: - **Structure I:** The cyclohexane ring has a CH₃ group and a CH₂CH₃ group. The CH₃ is axial, and the CH₂CH₃ is equatorial. - **Structure II:** The cyclohexane ring has a CH₃ group and a CH₂CH₃ group. Both are equatorial. - **Structure III:** The cyclohexane ring has a CH₃ group and a CH₂CH₃ group. The CH₃ is equatorial, and the CH₂CH₃ is axial. - **Structure IV:** The cyclohexane ring has a CH₃ group and a CH₂CH₃ group. Both are axial. **Options:** Select one: - A. I - B. III - C. II - D. IV **Explanation:** To determine the most stable conformation for trans-1-ethyl-3-methylcyclohexane, consider the spatial orientation of substituents. The trans configuration requires one substituent to be axial and the other equatorial. Consider steric hindrance and energy minimization for stability.
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