Question

Among the metal carbonyls [Mn(CO)6]+, [Ti(CO)6], [Cr(CO)6] and [V(CO)6]−, the C-O bond
order would be lowest in? Give reason for the answer.

Answer 1

The Ti− complex, involving the only d⁵ metal in a host of d⁶ metals, is actually the one with the smallest bond order because it has the least number of electrons in the t₂g orbitals, which are always nonbonding if σ donation is present but π acceptance is not, and may be at least a bit bonding when π acceptance is additionally present.

Answer 2

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