Bonding in Metal Carbonyls

Among the given complexes that possess "$\mathrm{CO}$" ligand bridges are

$\underset{\mathrm{I}}{\left[{\mathrm{Co}}_2{\left(\mathrm{CO}\right)}_8\right]} \underset{\mathrm{II}}{ \left[{\mathrm{Fe}}_3{\left(\mathrm{CO}\right)}_{12}\right]} \underset{\mathrm{III}}{\left[{\mathrm{Mn}}_2{\left(\mathrm{CO}\right)}_{10}\right]} \underset{\mathrm{IV}}{\left[{\mathrm{Fe}}_2{\left(\mathrm{CO}\right)}_9\right]}$

Which of the following complexes has the strongest metal-carbon bond?

Write a short note on bonding in metal carbonyls.

The correct pair of orbitals involved in $\pi$ -bonding between metal and $\mathrm{CO}$ in metal carbonyl complexes is:

The $\mathrm{V}-\mathrm{C}$ bond distances in $\mathrm{V}(\mathrm{CO}{)}_6$ and ${\left[\mathrm{V}(\mathrm{CO}{)}_6\right]}^{-}$ are respectively $($in $\mathrm{pm})$

Which of the following is correctly matched?

The correct sequence of $\mathrm{CO}$ bond length in the given compound is:

(I) $\mathrm{Fe}{\left(\mathrm{CO}\right)}_5$

(II) $\mathrm{CO}$

(III) ${\mathrm{H}}_3\mathrm{B}\leftarrow \mathrm{CO}$

(IV) ${\left[\mathrm{Mn}{\left(\mathrm{CO}\right)}_5\right]}^{-}$

The bond length of $\mathrm{C}-\mathrm{O}$ bond in $\mathrm{CO}$ is $1.128 \mathrm{\AA }$. The $\mathrm{C}-\mathrm{O}$ bond in $\mathrm{Fe}{\left(\mathrm{CO}\right)}_5$, is-

In which compound synergic effect is present ?

In $\mathrm{Fe}(\mathrm{CO}{)}_5$, the $\mathrm{Fe}-\mathrm{C}$ bond possesses :-

In which of the following complexes, the bond order of $\mathrm{C}-\mathrm{O}$ is minimum :-

Among the following metal carbonyls, the $\mathrm{C}-\mathrm{O}$ bond order is lowest in :-

Which of following involves maximum $\mathrm{C}-\mathrm{O}$  bond length :-

The $\mathrm{V}-\mathrm{C}$ distance in $\mathrm{V}(\mathrm{CO}{)}_6$ and ${\left[\mathrm{V}(\mathrm{CO}{)}_6\right]}^{-}$ are respectively (in $\mathrm{pm}$ ) :

Carbon monoxide is a very common ligand in organometallic chemistry. It is particularly good at stabilising low oxidation states of central metal such as Fe(CO)₅.

When $\mathrm{CO}$ approaches metal as ligand, a sigma bond is formed as a result of overlap of lone pair of carbon atom and empty hybridised orbital of metal. Apart from it, empty $\mathrm{CO}$ antibonding orbital accepts $\text{π}$-electron density from the filled $\mathrm{d}$-orbitals on the metal atom side by side, which is sometimes also referred as $\text{π}$-back bonding.

Carbon monoxide is not appreciably nucleophilic, i.e., $\text{σ}$-bond formed with metal is weak. But many $\mathrm{d}$-metal carbonyl compounds are very stable. Thus, we can infer that the strength of $\text{π}$-back bonding enhances the stability of carbonyl complexes by increasing the strength of $\text{σ}$-bond between metal and carbonyl.

Which of the following has shortest metal carbon bond ?

Carbon monoxide is a very common ligand in organometallic chemistry. It is particularly good at stabilising low oxidation states of central metal such as Fe(CO)₅.

When CO approaches metal as ligand, a sigma bond is formed as a result of overlap of lone pair of carbon atom and empty hybridised orbital of metal. Apart from it, empty CO antibonding orbital accepts $\text{π}$-electron density from the filled d-orbitals on the metal atom side by side, which is sometimes also referred as $\text{π}$-back bonding.

Carbon monoxide is not appreciably nucleophilic, i.e., $\text{σ}$-bond formed with metal is weak. But many d-metal carbonyl compounds are very stable. Thus, we can infer that the strength of $\text{π}$-back bonding enhances the stability of carbonyl complexes by increasing the strength of $\text{σ}$-bond between metal and carbonyl.

The longest $\mathrm{CO}$ bond length will be with

I) $\left[\mathrm{Co}{\left(\mathrm{CO}\right)}_6\right]$ II) $\left[\mathrm{Co}{\left(\mathrm{CO}\right)}_5\right({\mathrm{NH}}_3\left)\right]$ III) $\left[\mathrm{Co}{\left(\mathrm{CO}\right)}_4{\left({\mathrm{NH}}_3\right)}_2\right]$

IV) $\left[\mathrm{Co}{\left(\mathrm{CO}\right)}_3{\left({\mathrm{NH}}_3\right)}_3\right]$ V) $\left[\mathrm{Co}{\left(\mathrm{CO}\right)}_2{\left({\mathrm{NH}}_3\right)}_4\right]$

VI) $\left[\mathrm{Co}\right(\mathrm{CO}\left){\left({\mathrm{NH}}_3\right)}_5\right]$

Predict the CORRECT statement for these compounds?

Correct statement for these compounds is :

(i) $\mathrm{Co}{\left(\mathrm{CO}\right)}_6$

(ii) $\mathrm{Co}{\left(\mathrm{CO}\right)}_5{\mathrm{NH}}_3$

(iii) $\mathrm{Co}{\left(\mathrm{CO}\right)}_4{\left({\mathrm{NH}}_3\right)}_2$

(iv) $\mathrm{Co}{\left(\mathrm{CO}\right)}_3{\left({\mathrm{NH}}_3\right)}_3$

(v) $\mathrm{Co}{\left(\mathrm{CO}\right)}_2{\left({\mathrm{NH}}_3\right)}_4$

(vi) $\mathrm{Co}\left(\mathrm{CO}\right){\left({\mathrm{NH}}_3\right)}_5$

The type of character the $\mathrm{Fe}-\mathrm{C}$ bond possesses in $\mathrm{Fe}(\mathrm{CO}{)}_5$ is

Correct sequence of $\mathrm{C}\mathrm{O}$ bond order in given compounds is
(P) $\mathrm{F}\mathrm{e}(\mathrm{C}\mathrm{O}{)}_5$ (Q) $\mathrm{C}\mathrm{O}$ (R) ${\mathrm{H}}_3\mathrm{B}\leftarrow \mathrm{C}\mathrm{O}$ (S) $\left[\mathrm{M}\mathrm{n}\right(\mathrm{C}\mathrm{O}{)}_5{]}^{-}$