In metal carbonyls, there is synergic bonding interaction between metal and carbon monoxide.This leads to increase in strength of metal ligand bond and decrease in bond order of CO in carbonyl complex as compared to bond order in carbon monoxide.
Simple carbonyls are invariably spin-paired complexes except for vanadium metal.
Which one of the following metal carbonyls involves the `d^2sp^3` hybridisation for the formation of metal-carbon `sigma` bonds and is paramagnetic ?
A. `[Cr(CO)_6]`
B. `[V(CO)_6]`
C. `[Mo(CO)_6]`
D. `[W(CO)_6]`