6. Consider a linear H4 molecule.
(a) Is the molecule centrosymmetric? What is its point group?
(b) Some possible arrangements of the 4 s orbitals in the H4 molecule are shown below. Classify each as u or g. Which of these arrangements have the proper symmetry to be the basis of molecular orbitals for H4?
(c) The linear H4 molecule should have four molecular orbitals. What are those orbitals? Rank them from low energy to high energy. Which will be filled, which empty? Should linear H4 be stable? Would it be it paramagnetic?