FAQs on Chair Conformations of Cyclohexane

Question 1

1. What is a chair conformation of cyclohexane?

Accepted Answer

Ans. A chair conformation is one of the most stable conformations of cyclohexane, a six-membered carbon ring. In this conformation, the carbon atoms are arranged in a way that resembles the shape of a chair, with alternate carbon atoms above and below the plane of the ring. It is called a chair conformation due to its resemblance to a chair or a seat.

Question 2

2. Why is the chair conformation of cyclohexane considered stable?

Accepted Answer

Ans. The chair conformation of cyclohexane is considered stable because it minimizes the strain caused by the bond angles and eclipsing interactions between the hydrogen atoms. In this conformation, all the carbon-carbon bond angles are close to the ideal tetrahedral angle of 109.5 degrees, reducing the strain. Additionally, the hydrogen atoms in axial positions are far apart from each other, reducing steric hindrance.

Question 3

3. How do the chair conformations of cyclohexane interconvert?

Accepted Answer

Ans. The chair conformations of cyclohexane can interconvert through a process called ring flipping. In this process, the molecule undergoes a rotation, causing the carbon atoms to switch between their axial and equatorial positions. The ring flipping occurs through a half-chair intermediate, where the molecule briefly adopts a distorted conformation before reaching the other chair conformation.

Question 4

4. What are the different types of substituents in chair conformations of cyclohexane?

Accepted Answer

Ans. In chair conformations of cyclohexane, there are two types of substituents: axial and equatorial. Axial substituents are positioned vertically above or below the plane of the ring, while equatorial substituents are positioned in the plane of the ring. Axial substituents experience more steric hindrance and are less stable compared to equatorial substituents due to their proximity to other axial substituents.

Question 5

5. How does the stability of chair conformations affect chemical reactions of cyclohexane?

Accepted Answer

Ans. The stability of chair conformations of cyclohexane plays a significant role in determining the reactivity of the molecule. In general, reactions preferentially occur at the more stable conformation, which is the chair conformation. This is because the chair conformation minimizes steric hindrance and strain, making it more favorable for reactants to approach and interact with the molecule. The stability of chair conformations also affects the relative reactivity of different substituents in cyclohexane.

Chair Conformations of Cyclohexane Video Lecture - Organic Chemistry

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