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Remove one of the hydrogens on C2 of the butane model you built, and replace it...

Remove one of the hydrogens on C2 of the butane model you built, and replace it with a methyl group to make 2-methyl butane. Sighting along the C2 – C3 bond (C2 placed in the front), draw
the Newman projections of the six conformers that accord to the local maxima and minima in the energy diagram. Draw the energy diagram. The y-axis is energy and the X-axis is degrees of rotation which represents the dihedral angle between C1 and C4. When rotating, keep C2 stationery, and rotate C3 clockwise. Start with the dihedral angle of 0°. Also label the extrema in the energy diagram with the letter of each conformer.

Which conformers are of equal energy?_

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