15. Which of the following statements relating to molecular orbital (MO) theory is incorrect?
(A) Combination of two atomic orbitals produces one bonding and one antibonding MO.
(B) A bonding MO is lower in energy than the two atomic orbitals from which it is formed.
(C) Combination of two 2p orbitals may result in either σ or π MOs.
(D) A species with a bond order of zero will not be stable.
(E) In a stable molecule having an even number of electrons, all electrons must be paired.