Least energetic conformation of cyclohexane is

Step-by-step solution

Cyclohexane exists in two forms and these are chair and boat conformations. In the chair form, all the C - H bonds on adjacent carbon atoms, are in the skew position. In the boat form, four of the C - H bonds are skew (1,2 ; 3,4 ; 4,5 and 6,1 ) and two are eclipsed (2,3 and 5,6 ) . At the same time, there will also be some bond opposition strain for these two pairs of eclipsed bonds and also steric repulsion between the hydrogen pointing towards each other at 1 and 4 . Hence, the total strain in the boat conformati