The $V-C$ distance in $[V(CO)_6]$ and $[V(CO)_6]^-$ are respectively (in $pm$):

Which is not true about metal carbonyls?

Wilkinson's catalyst,used as a homogeneous catalyst in the hydrogenation of alkenes,contains which of the following metals?

The correct statement$(s)$ regarding the binary transition metal carbonyl compounds is (are) (Atomic numbers: $Fe = 26, Ni = 28$)
$A$. Total number of valence shell electrons at metal centre in $Fe(CO)_5$ or $Ni(CO)_4$ is $16$
$B$. These are predominantly low spin in nature
$C$. Metal-carbon bond strengthens when the oxidation state of the metal is lowered
$D$. The carbonyl $C-O$ bond weakens when the oxidation state of the metal is increased

What is the name of the complex formed by the coordination reaction of carbon monoxide?

Among the following,which is not the $\pi$-bonded organometallic compound?