Given below are two statements:
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-

Question

Given below are two statements:
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.
Choose the most appropriate answer:

Canvas Classes · Accepted Answer

Strategy:
 Verify the oxidation states in metal carbonyls and understand the bonding mechanism that stabilizes these zero oxidation states.

Step 1: Evaluate Assertion (A)
In metal carbonyls like  and , the carbonyl ligand () has zero charge. Consequently, both Nickel and Iron have an oxidation state of exactly 0.
(Assertion A is True).

Step 2: Evaluate Reason (R)
The extreme stability of zero oxidation state complexes containing CO is due to synergic bonding. The metal -donates to the ligand w

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