AP BIOLOGY

Detailed explanation-1: -The energy of the eclipsed conformation is approximately 3 kcal/mol (12 kJ/mol) higher than that of the staggered conformation. Torsional strain (or eclipsing strain) is the name give to the energy difference caused by the increased electrostatic repulsion of eclipsing bonds.

Detailed explanation-2: -For the potential energy graph, the energy difference between eclipse and staggered is 12 KJ/mol.

Detailed explanation-3: -The energy of the eclipsed conformation is approximately 3 kcal/mol higher than that of the staggered conformation. Another 60°rotation returns the molecule to a second eclipsed conformation.

Detailed explanation-4: -The eclipsed conformer with the largest group on each carbon overlapping with each other will always be the highest energy conformer of that bond. To convert between eclipsed and staggered conformations (or vice versa), one carbon, with all of its substituents, is rotated 60 degrees.