Question

$\left[Ni\right(CO{)}_4]>[Co(CO{)}_4{]}^{-}>[Fe(CO{)}_4{]}^{2-}$ is the correct order with respect to M-C $\pi$ bond. Where M=Ni, Fe, and Co

• A. True
• B. False

Answer 1

The correct option is B False

In carbonylate anion, the metal has a greater electron density to

be dispersed, with the result that M-C, $\pi$ bonding is enhanced in

strength. Hence the correct order is$\left[Ni\right(CO{)}_4]<[Co(CO{)}_4{]}^{-}<[Fe(CO{)}_4{]}^{2-}$. for strength of M - C$\pi$ bond.