Question

Which of the following conformer represent the chair form of cyclohexane ?

• A.
• B.
• C.
• D.

Answer 1

The correct option is C

Chair form is the most stable conformation of cyclohexane.
It is almost free of angle strain and also it is fully staggered conformation having no torsional strain and no steric repulsion between hydrogen atoms.

In chair form, axial bonds are vertical and alternate above and below the ring and equatorial bonds point outward from the ring and are on a slant.

Thus, option (c) is chair form of cyclohexane
Option (a) - Half chair form of cyclohexane
Option (b) - Twist boat form of cyclohexane
Option (d)- Boat form of cyclohexane