3 4. Four Newman projections for the conformation of 2-methylbutane are given below. Please answer the following questions by placing the letter corresponding to the correct projection in the space provided (8 points). C) Which of the Newman projection formulas has two Gauche interactions? A. Which of the labeled bonds in the structure are equatorial bonds? ___________ b. Which of the labeled bonds is trans to bond b? ___________ c. Which bonds have a 1,3-diaxial interaction with each other? Draw each cis-trans pair for your choice and indicate the geometry of each isomer.(Credit 12). On your choice. 6. Which of the following compounds can exist as pairs of cis-trans isomers?
