●●●●● ●●●● The effect of rotation on the potential energy of ●●0 butane around the central carbon -carbon bond is ●●● ●●●● more significant, as shown above. The structure shown at o is fully eclipsed, that is, both methyl groups are aligned and are interacting maximally As che front methyl group is rotated 60, a gauche conformation is produced in which the methyl group is nestled between the back methyl and the adjacent hydrogen atom. Another 60 rotation produces an approximately 2. 4 kcall mole less stable. At 180. the eclipsed version of the gauche conformation which anti conformation is formed in which the two meth groups are on opposite faces of the molecule and no groups are eclipsed. This is the most stable conformers and it differs from the fully eclipsed conformers by about 5 kcal mole in potential energy Further rotations regenerate an equivalent eclipse gauche conformer(at 240), another gauche form 300)and finally, the eclipsed form at 360⚫ The effect of rotation on the potential energy of butane around the central carbon-carbon bond is more significant, as shown above. The structure shown at 0 is fully eclipsed, that is, both methyl groups are aligned and are interacting maximally. As the front methyl group is rotated 60, a gauche conformation is produced in which the methyl group is nestled between the back methyl and the adjacent hydrogen atom. Another 60 rotation produces an eclipsed version of the gauche conformation which is approximately 2.4 kcal/mole less stable. At 180, the anti conformation is formed in which the two methyl groups are on opposite faces of the molecule and no groups are eclipsed. This is the most stable conformers and it differs from the fully eclipsed conformers by about 5 kcal/mole in potential energy. Further rotations regenerate an equivalent eclipsed gauche conformer (at 240), another gauche form (300) and finally, the eclipsed form at 360