Assertion A: In the complex and , the metals have zero oxidation state. Reason R: Low oxidation states are found when a complex has ligands capable of -donor character in addition to -bonding. [2023]

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Q.
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 $σ$ -bonding.

In the light of the above statements, choose the most appropriate answer from the options given below: [2023]

1 A is correct but R is not correct

2 Both A and R are correct and R is the correct explanation of A

3 A is not correct but R is correct

4 Both A and R are correct but R is NOT the correct explanation of A

Ans.
(1)

CO is not a $π$ -donor ligand; rather, it is a $σ$ -donor and $π$ -acceptor ligand. Also, CO is a neutral ligand and hence the metal associated with it in a complex shows zero oxidation state.

Solution

1 A is correct but R is not correct

2 Both A and R are correct and R is the correct explanation of A

3 A is not correct but R is correct

4 Both A and R are correct but R is NOT the correct explanation of A

Ans.
(1)

CO is not a $π$ -donor ligand; rather, it is a $σ$ -donor and $π$ -acceptor ligand. Also, CO is a neutral ligand and hence the metal associated with it in a complex shows zero oxidation state.

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Solution

1 A is correct but R is not correct

2 Both A and R are correct and R is the correct explanation of A

3 A is not correct but R is correct

4 Both A and R are correct but R is NOT the correct explanation of A

Ans. (1) CO is not a π-donor ligand; rather, it is a σ-donor and π-acceptor ligand. Also, CO is a neutral ligand and hence the metal associated with it in a complex shows zero oxidation state.

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Ans.
(1)

CO is not a $π$ -donor ligand; rather, it is a $σ$ -donor and $π$ -acceptor ligand. Also, CO is a neutral ligand and hence the metal associated with it in a complex shows zero oxidation state.