複選題24. Which of the following statements about ligand binding and reactivity in organometallic complexes are CORRECT? Select all that apply. (A) Strong -acceptor ligands, such as CO, stabilize low-valent metal centers by withdrawing electron density from the metal. (B) Ligand exchange in organometallic complexes often depends on the relative binding affinities of incoming and outgoing ligands. (C) In the migratory insertion of CO into a metal-alkyl bond, the metal-carbon bond is formally cleaved during the reaction. (D) Chelating ligands enhance the thermodynamic stability of a metal complex by increasing the chelate effect. (E) ẞ-Hydride elimination requires a vacant coordination site on the metal to accommodate the hydride.