Given below are two statements : one is labelled as "Assertion A" and the other is labelled as "Reason R".
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 the -bonding.
In the light of the above statements, choose the most appropriate answer from the option given below.
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 the -bonding.
In the light of the above statements, choose the most appropriate answer from the option given below.
- (A) is correct but is not correct✓ Correct
- (B) is not correct but is correct
- (C)Both and are correct but is NOT the correct explanation of
- (D)Both and are correct and is the correct explanation of .
Answer: (A)
Solution
Assertion A is correct: CO is a neutral ligand, so in and , the metals have zero oxidation state. However, Reason R is incorrect: low oxidation states are stabilized by ligands with -acceptor character (not -donor), which participate in synergic bonding. CO is a -acceptor ligand that back-bonds with metal d-orbitals, stabilizing the zero oxidation state.
JEE Main · 2023 · 06 Apr 2023 · Shift 2 · Single correct option