Given below are two statements: one is labelled as “Assertion A” and the other is labelled as “Reason R” Assertion A : In the complex Ni ( CO ) 4 and Fe ( CO ) 5 , the metals have zero oxidation state

Question

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

Assertion A : In the complex $Ni (CO)_{4}$ and $Fe (CO)_{5}$ , the metals have zero oxidation state.

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

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

TestHub · Accepted Answer

The ligand carbon monoxide has no charge, hence metals have zero oxidation state in both $Ni (CO)_{4}$ and $Fe (CO)_{5}$ . Low oxidation states are found when a complex has ligands capable of $π$ -acceptor character in addition to the $σ$ -bonding.
In the complexes, $Ni {(CO)}_{4} & Fe {(CO)}_{5}$ , the ligand $CO$ is $π -$ acceptor character in addition to the $σ - bonding$ .

Chemistry - Coordination Chemistry Question with Solution | TestHub

Options:

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