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

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

  1. A is correct but R is not correct
  2. A is not correct but R is correct
  3. Both A and R are correct but R is NOT the correct explanation of A
  4. Both A and R are correct and R is the correct explanation of A

Solution

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, NiCO4 & FeCO5, the ligand CO is π-acceptor character in addition to the σ-bonding.

Asked in: JEE Main 2023 (06 Apr Shift 2)

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