Which of the following is the most stable conformation of bromocyclohexane?
A)I
B)II
C)III
D)IV

Question

Which of the following is the most stable conformation of bromocyclohexane? 
A)I 
B)II 
C)III 
D)IV

Quizplus · Accepted Answer

The most stable conformation of bromocyclohexane will have the bromine atom in an equatorial position, as this reduces steric strain from the bulky halogen substituent. This leaves us with options III, IV, and V.
In option III, there is a gauche interaction between the axial methyl group and the equatorial bromine, which would increase the overall energy of the molecule. In option IV, both axial positions are occupied by methyl groups, which would create significant steric strain. Option V has the bromine in an axial position, which is less stable than an equatorial position.
Thus, option III is the most stable conformation of bromocyclohexane.

Which of the Following Is the Most Stable Conformation of Bromocyclohexane