Why does cis$-1,4-$di$-$tert$-$butylcyclohexane exist

primarily in a twist$-$boat form rather than a chair

conformation?

A

In the chair conformation, one tert$-$butyl

group is axial and one tert$-$butyl group

is equatorial. Adopting a twist$-$boat form

relieves gauche steric strain.

In the chair conformation, both tert$-$

B

butyl groups are equatorial. Adopting a

twist$-$boat form relieves gauche steric

strain.

In the chair conformation, one tert$-$butyl

C

group is axial and one tert$-$butyl group

is equatorial. Adopting a twist$-$boat form

relieves $1,3-$diaxial steric strain.

In the chair conformation, both tert$-$

D

butyl groups are axial. Adopting a twist$-$

boat form relieves $1,3-$diaxial steric

strain.