4. Alkanes and Cycloalkanes

What is the mistake that was made in drawing each of the flipped chairs on the right from the chair on the left? [In these, assume that the angle through which you view the chair conformations doesn't change.]

(a)

Which of the following statements best describes the most stable chair conformation of $\mathrm{methylcyclohexane}$?

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

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

Determine if the following pairof chairs are identical, conformers or different.

For the compound ${\mathrm{trans}}_{1_2-\mathrm{dimethylcyclohexane}}$, please choose the correct set of chair and flipped chair conformations:

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 $2$?

Which is the most stable chair conformation of ${\mathrm{trans}}_{1,4}$-dimethylcyclohexane?

Which of the following chair conformations correctly represents ${\mathrm{trans}}^{1,3}-{\mathrm{dimethyl}}_{\mathrm{cyclohexane}}$?

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.

When a $\mathrm{cyclohexane}$ ring undergoes a chair flip, which of the following statements is correct regarding the positions of substituents on the ring?

Which statement correctly describes the most stable chair conformation of isopropylcyclohexane?

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)

Using the numbers shown in the chair conformation on the left, label the carbons of the flipped chair on the right. [Assume that the angle through which you view the chair conformation doesn't change.] 

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 $4$?