We learned that four new molecular orbitals are created from the p orbitals for each carbon atom in

题目

We learned that four new molecular orbitals are created from the p orbitals for each carbon atom in the butadiene molecule (the axes perpendicular to the page).Which statement about these molecular orbitals is NOT true?
A The four molecular p orbitals of the four carbon atoms can be lined up parallel in order to create four new molecular orbitals.
B The electrons in the new molecular orbitals benefit because they are not confined to just one atom.
C The electrons,because of the new molecular orbits,are spread out over the entire molecule.
D As a result of the new molecular orbitals,the bond between the second and third carbon atoms is not really a single bond.In fact,the bond should be shorter.

答案

D is not true,because in the newly formed 4 MO's,first two are occupied (bonding orbitals),and the 3rd and 4th are unoccupied.The lowest (in energy) orbital has equal electron density distribution bet...