Learning Path
Question & Answer1
Understand Question2
Review Options3
Learn Explanation4
Explore TopicChoose the Best Answer
A
Cis configuration
B
Trans configuration
C
Both configurations are equivalent
D
No configuration due to steric hindrance
Understanding the Answer
Let's break down why this is correct
Answer
The axial methyl at C‑1 points upward, while the equatorial methyl at C‑3 points downward in the chair form of cyclohexane. Because one substituent is above the ring plane and the other below it, the two methyl groups lie on opposite sides of the molecule. This arrangement is called the trans configuration, meaning the substituents are on opposite faces of the ring. For example, in a 1‑methyl‑3‑methylcyclohexane drawn in the chair conformation, the 1‑methyl is axial up and the 3‑methyl is equatorial down, giving a trans relationship.
Detailed Explanation
In cyclohexane, the axial position points straight up or down along the ring axis. Other options are incorrect because The cis option assumes both methyl groups share the same side of the ring; Saying the configurations are equivalent ignores the fixed orientation of each substituent.
Key Concepts
Cis-Trans Isomerism
Cycloalkane Derivatives
Topic
Cycloalkanes Naming
Difficulty
medium level question
Cognitive Level
understand
Practice Similar Questions
Test your understanding with related questions
1
Question 1In a bicyclic cycloalkane derivative with two methyl substituents, one on each of the fused rings, determine the correct cis or trans configuration if one methyl is on the equatorial plane of one ring and the other is axial on the adjacent ring. Which configuration is represented?
hardChemistry
Practice
2
Question 2In a substituted cyclohexane, how does the axial position of a bulky substituent influence angle strain and overall stability compared to when it is in the equatorial position?
mediumChemistry
Practice
3
Question 3When analyzing a cyclohexane derivative with a bulky substituent in the axial position, what effect does ring flipping have on the stability of the molecule?
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Practice
4
Question 4In a cyclohexane derivative featuring both a chlorine atom and a methyl group, which substituent position (axial or equatorial) would likely lead to a more stable chair conformation?
easyChemistry
Practice
5
Question 5In a cyclohexane derivative with a bulky substituent in the equatorial position, how does this affect the molecule's overall stability compared to when the same substituent is in the axial position?
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Practice
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