24. What is Tolman cone angle? Explain how it can influence the following equilibrium. How may this be important to catalysis? (10%) Ni(PR3)4 ⇌ Ni(PR3)3 + PR3

21. Consider the octahedral vanadyl ion, VO(H2O)5^2+: (15%) (a) First, construct the molecular orbital diagram of square pyramidal V(H2O)5^4+. Assume that H2O is a pure σ donor. Provide an appropriate label for each molecular orbital, sketch each molecular orbital, and fill in the correct number of electrons. (6%)