The cis-1,4-di-t-butylcyclohexane [cis-1,4-di(1,1-dimethylethyl)cyclohexane] and trans-1,4-di-t-butylcyclohexane stereoisomers can both be drawn but only one of them can easily be synthesized. Draw both conformers and suggest which of them is stable. Suggest a reason why the unstable conformer is unstable.