4. Alkanes and Cycloalkanes

Given the following Newman projection of ethane looking down the $C–C$ bond, which of the following wedge and dash structures correctly represents the same conformation?

Which of the following diagrams correctly represents a Newman projection for propane when viewed along the $C_1–C_2$ bond?

Given the following Newman projection of ethane viewed down the $C_1-C_2$ bond, which bond-line structure does it represent? (Front carbon: three hydrogens; back carbon: three hydrogens; all staggered)

Which of the following correctly represents the staggered conformation of ethane in a Newman projection when viewed down the $C–C$ bond?

Which of the following best describes the most stable Newman projection for 2,3-dimethylbutane when viewed down the C$2$-C$3$ bond?

Which of the following best describes the most stable Newman projection for $2_{\text{-methylbutane}}$ when viewed down the $C_2–C_3$ bond?

Which of the following diagrams represents a Newman projection of butane?

Which of the following best describes a Newman projection in which the front and back substituents are positioned directly in line with each other when viewed along the carbon-carbon bond axis?

Given the following Newman projection looking down the $C_2–C_3$ bond of a straight-chain alkane, where the front carbon ($C_2$) has a methyl group, an ethyl group, and a hydrogen, and the back carbon ($C_3$) has a methyl group, a hydrogen, and an ethyl group, what is the correct IUPAC name of the compound?

Which of the following best describes the most stable Newman projection for 2,3-dimethylpentane when viewed down the C$2_{-}$C$3_{}$ bond?

Given the staggered conformation of $C_2{H}_6$ (ethane), which of the following correctly matches the front and back substituents in a Newman projection looking down the $C–C$ bond?