Which of the following is the lowest energy chair conformation of $\mathrm{cyclohexane}$ with a ${\mathrm{tert}}^{-}-\mathrm{butyl}$ group at carbon $1$ and a $\mathrm{methyl}$ group at carbon $2$?

For each chair on the left, place the substituents on the flipped chair. [Recall that the axial/equatorial designation changes from one chair to the next, but the carbon to which the substituent is attached does not.]

(c)

For each chair on the left, place the substituents on the flipped chair. [Recall that the axial/equatorial designation changes from one chair to the next, but the carbon to which the substituent is attached does not.]

(e)

Which of the following structures represent the same compound? Which ones represent different compounds?

(e)

Use your models to do a chair–chair interconversion on each ring of the conformation of cis-decalin shown in Figure 3-27. Draw the conformation that results.

Which chair conformation of $\mathrm{methylcyclohexane}$ is the most stable?

Which is the most stable chair conformation of ${\mathrm{trans}}_{1,2}$-dimethylcyclohexane?

In the context of $\mathrm{cyclohexane}$, which chair conformation is most accurately represented by the Haworth projection?

Which of the following cyclohexane chair conformations represents the ring flip of the original structure where a methyl group (${\mathrm{CH}}_3$) is in the axial position on carbon $1$ and a bromine ($\mathrm{Br}$) is in the equatorial position on carbon $4$?