Bonding in Metal Carbonyls

Given below are two statements: one is labelled as “Assertion A” and the other is labelled as “Reason R”

Assertion A : In the complex $\mathrm{Ni}(\mathrm{CO}{)}_4$ and $\mathrm{Fe}(\mathrm{CO}{)}_5$, the metals have zero oxidation state.

Reason R : Low oxidation states are found when a complex has ligands capable of $\pi$-donor character in addition to the $\sigma$-bonding.

In the light of the above statements, choose the most appropriate answer from the options given below

The number of sigma and pi bonds present in ${\mathrm{Fe}}_2{\left(\mathrm{CO}\right)}_9$ respectively are

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

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

In which of the following complex formation the bond length of the ligand (mentioned in brackets) decreases as compared to its isolated state.

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

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

The number of bridging carbonyls in ${\mathrm{Co}}_2{\left(\mathrm{CO}\right)}_8$ is

 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 transition metal in which of the following compound has zero oxidation state?

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:

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

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

In $\left[{\mathrm{Mn}}_2(\mathrm{CO}{)}_{10}\right]$, the count of $\mathrm{Mn}-\mathrm{Mn}$ bond(s) is/are  ________.

The coordination geometry around the manganese in decacarbonyldimanganese$\left(0\right)$

In which one of the following metal carbonyls, $\mathrm{CO}$ forms a bridge between metal atoms?

Shape of ${\mathrm{Mn}}_2{\left(\mathrm{CO}\right)}_{10}$