(Solved): (a) Draw a Newman projection of 2-methylbutane, looking down the C2C3 bond. (b) 2-methylbu ...

(a) Draw a Newman projection of 2-methylbutane, looking down the ${\mathrm{C}}_2?{\mathrm{C}}_3$ bond. (b) 2-methylbutane (c) Draw the corresponding wedge-and-dash depiction. (Wedge-and-dash is just the style we have been using to show the geometry at tetrahedral carbons.) (d) Make a full $360^{?}$ rotation around the ${\mathrm{C}}_2?{\mathrm{C}}_3$ bond in $60^{?}$ increments. Draw Newman projections of each conformation. (e) Define a reference substituent on ${\mathrm{C}}_2$ and one on ${\mathrm{C}}_3$ so that you can assign a dihedral angle to each of your Newman projections from part c. (f) Assign relative energies to each of the six conformations. (g) Make a plot of energy versus dihedral angle for rotation about the ${\mathrm{C}}_2?{\mathrm{C}}_3$ bond of 2 methylbutane.