Question

Which one of the following metal carbonyls involves the $d^{2}s{p}^3$ hybridisation for the formation of metal-carbon $\sigma$ bonds and is paramagnetic?

• A. $\left[Cr\right(CO{)}_6]$
• B. $\left[V\right(CO{)}_6]$
• C. $\left[Mo\right(CO{)}_6]$
• D. $\left[W\right(CO{)}_6]$

Answer 1

The correct option is B $\left[V\right(CO{)}_6]$

In $\left[V\right(CO{)}_6]$ ,4s electrons of V gets shifted to 3d orbital and 6 (CO) groups form coordinate bond in 3d (2) ,4s (1) and 4p (3) orbitals .

This its hybridisation is $d_{2}s{p}_3$ and it is paramagnetic since it have one unpaired electron residing in 3d orbital.