Question

Which of the following has multiple bond character in M-C bond

• A. $\left[\text{Ni}{\left(\text{CO}\right)}_{\text{4}}\right]$
• B. ${\left[\text{Co}{\left(\text{CO}\right)}_{\text{4}}\right]}^{-}$
• C. ${\left[\text{Fe}{\left(\text{CO}\right)}_{\text{4}}\right]}^{2-}$
• D. (B) and (C) both have equal multiple bond character in M-N BOND

Answer 1

The correct option is A $\left[\text{Ni}{\left(\text{CO}\right)}_{\text{4}}\right]$

It will show synergic bonding interaction

$Like\left[Ni{\left(CO\right)}_4\right],\left[Fe{\left(CO\right)}_5\right],\left[C{o}_2{\left(CO\right)}_8\right]$