11. The energy difference between staggered and eclipsed conformations of ethane is 12.0 kJ/mol, propane is 13.6 kJ/mol,what is the C-C bond energy in the eclipsed form in propane?
(A)4.0 kJ/mol
(B)8.0 kJ/mol
(C)1.6 kJ/mol
(D)5.6 kJ/mol
(E)none of the above