NEETChemistryCoordination Compounds
Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A): Oxalate ion ( C₂O₄²⁻ ) is an example of an ambidentate ligand. Reason (R): Oxalate ion coordinates to the central metal ion simultaneously through two oxygen atoms. In the light of the above statements, choose the most appropriate answer from the options given below:
Options
- ABoth Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of Assertion (A).
- BAssertion (A) is false but Reason (R) is true.
- CBoth Assertion (A) and Reason (R) are true but Reason (R) is not the correct explanation of Assertion (A).
- DAssertion (A) is true but Reason (R) is false.
Correct answer
B. Assertion (A) is false but Reason (R) is true.
Step-by-step solution
Assertion (A) is false because ambidentate ligands are unidentate ligands that contain two different donor atoms and can coordinate through either of them (e.g., NO₂^- , SCN^- ). Oxalate ion ( C₂O₄²⁻ ) is a didentate ligand, not an ambidentate ligand. Reason (R) is true because the oxalate ion has two oxygen donor atoms and it coordinates to the central metal ion simultaneously through both of these oxygen atoms to form a chelate ring. Therefore, Assertion (A) is false but Reason (R) is true. Answer: Assertion (A)