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Conformations of Propane Construct a model of a propane molecule. Rotate the carbon atoms so that both of the C-C bonds are in a staggered conformation. 12. Draw a Newman projection of this conformation looking down one of the C-C bonds. Use CH3 to represent the methyl group of the third carbon. 13. Describe any planes of symmetry present in this conformation. 14. Describe any axes of symmetry present in this conformation. Now rotate the carbon atoms so that both of the C-C bonds are in an eclipsed conformation. 15. Draw a Newman projection of this conformation looking down one of the CC bonds. Use CH3 to represent the methyl group of the third carbon. 16. Describe any planes or axes of symmetry present in this conformation. Now rotate the carbon atoms so that one of the C-C bonds has an eclipsed conformation and the other a staggered conformation. 17. Draw a dashed wedge diagram for this arrangement. 18. Describe any planes or axes of symmetry present in this conformation. 19. In a similar manner to the ethane molecule, sketch a fully labelled graph of the energy of an propane molecule against dihedral angle as the molecule is rotated around orle of the CC bonds. In propane the torsioflal strain increases to 19kJ/mole. 20. Explain the increase in torsibhal strain energy for propane as opposed to ethane. Conformations of Propane Construct a model of a propane molecule. Rotate the carbon atoms so that both of the C-C bonds are in a staggered conformation. 12. Draw a Newman projection of this conformation looking down one of the C-C bonds. Use CH3 to represent the methyl group of the third carbon. 13. Describe any planes of symmetry present in this conformation. 14. Describe any axes of symmetry present in this conformation. Now rotate the carbon atoms so that both of the C-C bonds are in an eclipsed conformation. 15. Draw a Newman projection of this conformation looking down one of the CC bonds. Use CH3 to represent the methyl group of the third carbon. 16. Describe any planes or axes of symmetry present in this conformation. Now rotate the carbon atoms so that one of the C-C bonds has an eclipsed conformation and the other a staggered conformation. 17. Draw a dashed wedge diagram for this arrangement. 18. Describe any planes or axes of symmetry present in this conformation. 19. In a similar manner to the ethane molecule, sketch a fully labelled graph of the energy of an propane molecule against dihedral angle as the molecule is rotated around orfe of the CC bonds. In propane the torsiotlal strain increases to 19kJ/mole