4. Alkanes and Cycloalkanes

Which of the following is the most stable conformation of $\mathrm{cis}-1-\mathrm{ethyl}-3-\mathrm{isopropyl}\mathrm{cyclohexane}$?

For $2-\mathrm{butene}$, which conformation has the lowest energy due to minimized steric interactions?

Which of the following is the most stable conformation of $\mathrm{trans}-1-\mathrm{ethyl}-3-\mathrm{methylcyclohexane}$?

Which of the following is the most stable conformation of $2_{\text{-}}\text{butene}$?

Which of the following is not among the standard conformations of $\mathrm{butane}$?

Which of the following best describes the lowest energy (most stable) chair conformation of $\text{trans-1-ethyl-2-methylcyclohexane}$?

Which of the following best describes the lowest energy conformation of $\mathrm{cis}$-$1$-ethyl-$3$-isopropylcyclohexane?

Which of the following is the most stable conformation of $\mathrm{Br}$omocyclohexane?

Which of the following best describes the difference between $\mathrm{cis}$ and $\mathrm{trans}$ conformations in cyclohexane rings?

Which of the following substituted $\mathrm{cyclohexanes}$ is most stable?

In the lowest energy (anti) conformation of 2-bromobutane, which group is gauche to the ${\mathrm{Br}}_{}$ group?

Which of the following represents a gauche conformation for butane?

Which of the following is the most stable conformation of $\mathrm{cis}-1-\mathrm{isopropyl}-3-\mathrm{methylcyclohexane}$?

Which of the following best describes the lowest energy chair conformation of $\text{cis-1-ethyl-2-isopropylcyclohexane}$?

Which of the following is the most stable conformation of $\text{trans-1-isopropyl-3-methylcyclohexane}$?