Bonding in Metal Carbonyls

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

 Homonuclear metal carbonyls are those that have two or more than two metal centres but are of the same type.

An example of homonuclear metal carbonyl is

How the polynuclear metal carbonyls are classified on the basis of type of metals?

Write a note on the classification of metal carbonyls.

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

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

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

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

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) $\left[\mathrm{M}\mathrm{n}\right(\mathrm{C}\mathrm{O}{)}_5{]}^{-}$

Metal 'M' forms a carbonyl compound in which it is present in its lower valence state. Which of the following bonding is possible in this metal carbonyl?

The theory that can completely/properly explain the nature of bonding in $\left[\mathrm{N}\mathrm{i}\right(\mathrm{C}\mathrm{O}{)}_4]$ is

In metal carbonyls, there is –

The number of bridging $\mathrm{CO}$ ligand $\left(\mathrm{s}\right)$ and $\mathrm{Co}-\mathrm{Co}$ bond$\mathrm{ }\left(\mathrm{s}\right)$ in ${\mathrm{Co}}_2{\left(\mathrm{CO}\right)}_8$, respectively are

Among the following metal carbonyls, the $C-O$ bond order is lowest in

The correct order of $\mathrm{M}-\mathrm{C}\mathrm{\pi }$ bond and strength in given metal carbonyls is -

The correct order of $\mathrm{M}–\mathrm{C}\mathrm{ }\mathrm{\pi }$ bond and strength in given metal carbonyls is -

Which of the following organometallic compound is $\sigma$and $\pi$ bonded?

Metal Carbonyls In $\mathrm{F}\mathrm{e}{\left(\mathrm{C}\mathrm{O}\right)}_5$, the $\mathrm{F}\mathrm{e}-\mathrm{C}$ bond has: