Most unstable metal carbonyl among the following is 1.Ni(CO)4 2.V(CO)6 3.Fe(CO)5 4.Cr(CO)

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. 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. 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. 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?

Q. Among the following, select paramagnetic species:
$\begin{array}{cccc}\text{I.}& \left[Ni\right(CO{)}_4]& \text{II.}& \left[Ni\right(CN{)}_4{]}^{2-}\\ \text{III.}& \left[Ni\right(N{H}_3{)}_4{]}^{2+}& \text{IV.}& \left[Ni\right(H_{2}O{)}_4{]}^{2+}\\ \text{V.}& \left[Fe\right(CO{)}_5]& \text{VI.}& Cr{O}_4^{2-}\\ \text{VII.}& Mn{O}_4^{-}& & \end{array}$