4. Alkanes and Cycloalkanes

Which of the following is not a conformer of $\mathrm{butane}$?

Which conformer of ${\mathrm{tert}}^{-}-\mathrm{butylcyclohexanol}$ is the most stable at room temperature?

Given the Newman projection of $2_3$,$3_{\mathrm{dimethylbutane}}$ looking down the $C_2–C_3$ bond, where both methyl groups are gauche to each other, estimate the strain energy of this conformation.

Which of the following statements about the conformations of acyclic alkanes is true?

Which chair conformation of $1_{\mathrm{tert}-\mathrm{butyl}}-4-\mathrm{methylcyclohexane}$ has the lowest energy?

Which of the following conformers of $C_2{H}_6$ (ethane) has the highest energy?

Which of the following represents a gauche conformer of $C_2{H}_6$ (ethane) or $C_2{H}_5{F}_2$ (2-fluoroethanol)?

Which of the following best describes the process of translating a theoretical conformer of ethane from the staggered to the eclipsed conformation?