Now rotate around both C-C bonds to obtain a fully eclipsed model, which should resemble this formula: H H H H od 11 16. Draw a Newman projection formula for this conformation, looking down either C-C bond. pred ( 17. Describe any planes or axes of symmetry that are present in this conformation. 18. Draw a dashed wedge-solid wedge formula for propane in which one C-C bond is staggered and the other C-C bond is eclipsed. 19. Describe any planes or axes of symmetry that are present in this half-staggered and half- eclipsed conformation of propane. 20. Just as you did for ethane (Question 12), plot the energy of a propane molecule (on the vertical axis) against the dihedral angle (on the horizontal axis) as you rotate the model about one of the two C-C bonds, starting at 0 for the eclipsed conformation and going through 360. 21. Do you expect the energy difference between staggered and eclipsed conformations in propane to be larger than, equal to, or smaller than the energy difference in ethane? Explain.