Chemistry - Coordination Chemistry Question with Solution | TestHub

Overlap and donation from the lone pair of C into a vacant (hybrid) metal orbital to form a $\mathrm{M}\leftarrow \mathrm{C}$ bond,

Overlap and the donation from a filled ${\mathrm{d}}_{\mathrm{xz}}$ or ${\mathrm{d}}_{\mathrm{yz}}$ orbital on M into a vacant antibonding ${\pi }_{\mathrm{p}}{}^{\ast }$ orbital on CO to form a $\mathrm{M}\to \mathrm{C}$ bond

Overlap and donation from the lone pair on vacant (hybrid) metal orbital into C to form a $\mathrm{M}\to \mathrm{C}$ bond,

Overlap and the donation from a filled vacant antibonding ${\pi }_{\mathrm{p}}{}^{\ast }$ orbital on C into ${\mathrm{d}}_{\mathrm{xz}}$ or ${\mathrm{d}}_{\mathrm{yz}}$ orbital on M to form a $\mathrm{M}\leftarrow \mathrm{C}$ bond