Which of the following statements is correct?

Options

A. `[NiCl_4]^(2-)` complex is more stable than `[Ni(dmg)_2]` due to higher CFSE value
B. With `d^2 sp^3` hybridisatión `[FeCl(CN)_4(O_2)]^(4-)` complex is diamagnetic
C. `[V(CO_6)]` is not very stable and easily reduces to `[V(CO)_6]^(Theta)`
D. Ligands such as `CO, CN^(Theta), NO^(o+)` are electron donor due to the presence of filled-molecular orbital

Answer

C