The stable form of trans-1,4-dimethylcylohexane is represented as:

Options

A.
B.
C.
D.

Answer

c

Explanation

First of all, there are two different dimethylcyclohexanes. One has both methyl substituents one the same side of the cyclohexane ring, it is the cis isomer ( cis is Latin for "on this side") The other has two methyl substituents on opposite side of the ring, it is the tran s isomer (trans is Latin for "across" ). cis-,4-dimethylclohexane and trans-1, 4-dimethylcyclohexane are called geometric isomers of cis-1,4-dimethycyclohexane and trans-1, 4-dimethycyclohexane are called geometric isomers of cis-trans stereoisomers-they have the same atoms, and the atoms are linked in the same order, but they differ in the spartial (stereo) arrangement of the atoms.

First we will determine which of the two chair conforms of cis- 1,4-dimethyl-cyclohexane is more stable. One chair conformer has one methyl group in an equatorial position and one methyl group in an axial position. The other chair conformer also has one Therefore, both chair conformers are equally stable.