12. The metal carbonyl which is most oxidizing among the following is 1). Cr(CO)6 2). Fe(CO)5 3). V(CO)6 4). Ni(CO)4

Q. Which amongst the following metal carbonyls are inner orbital complexes with diamagnetic property?
(I) $Ni(CO{)}_4$; (II) $Fe(CO{)}_5$; (III) $V(CO{)}_6$; (IV) $Cr(CO{)}_6$
Select the correct answer from the codes gives below:

Q. Consider the following complexes $\left[V\right(CO{)}_6{]}^{-},\left[Cr\right(CO{)}_6]$ and $\left[Mn\right(CO{)}_6{]}^{+}$. Then incorrect statement(s) about metal carbonyls is /are

Q. Among the metal carbonyls $\left[Mn\right(CO{)}_6{]}^{+},\left[Ti\right(CO{)}_6],[Cr\left(CO{)}_6\right]$ and $\left[V\right(CO{)}_6{]}^{-}$ the $C-O$ bond order would be lowest in :

Q. The $IR$ stretchin frequencies of free $CO$, and $CO$ in $\left[V\right(CO{)}_6{]}^{-},\left[Cr\right(CO{)}_6{]}^{-}$ and $\left[Mn\right(CO{)}_6{]}^{-}$ are $2143c{m}^{-1},1860c{m}^{-1},2000c{m}^{-1}$ and $2090c{m}^{-1}$, respectively. Then correct statement about metal carbonyls is?

Q. Consider the following complexes:
1) $Fe(CO{)}_5$
2) $Ni(CO{)}_4$
3) $K_4\left[Fe\right(CN{)}_6]$
4) $N{a}_3\left[Cu\right(SCN{)}_4]$
Which of the above complex obeys $EAN$ rule?