Consider two molecular orbitals ψ1 and ψ2 along the internuclear axis of a linear symmetrical triatomic molecule A2B (arranged as A-B-A). If the atomic orbitals corresponding to the outer atoms A are φA1 and φA2, and for the central atom B is φB, which form do the molecular orbitals take assuming all coefficients are positive, where ψ1 is completely bonding and ψ2 has a node at the central atom?

Identify the correct statements about dioxygen species from the following: (A) 1Δg singlet O2 has both electrons in the same π* orbital. (B) 3Σg− ground state O2 has electrons in different degenerate π* orbitals with parallel spins. (C) 1Σg+ singlet O2 is lower in energy than 1Δg. (D) 1Δg O2 is responsible for photochemical reactions in the atmosphere.

In the molecular orbital description of the CO molecule (with the CO bond along the z-axis), which of the following statements correctly describes the Lowest Unoccupied Molecular Orbital (LUMO)?