Question

Match the following.

• A. I-B, II-C, III-A, IV-D
• B. I-C, II-B, III-D, IV-A
• C. I-D, II-A, III-C, IV-B
• D. I-A, II-D, III-B, IV-C

Hint:

EDTA is the most important hexadentate ligand, while oxalate \((C_2O_4^{2-})\) is a common bidentate ligand.

Answer 1

The Correct Option is A

Concept: Ligands are ions or molecules that donate electron pairs to a central metal atom. Depending upon the number and nature of donor atoms, ligands are classified into various categories.

Step 1: Identify the polydentate ligand. EDTA contains six donor atoms and can bind through six coordination sites. Therefore: \[ \boxed{\text{Polydentate} \rightarrow \text{EDTA}} \]

Step 2: Identify the bidentate ligand. Oxalate ion: \[ C_2O_4^{2-} \] coordinates through two oxygen atoms. Hence: \[ \boxed{\text{Bidentate} \rightarrow C_2O_4^{2-}} \]

Step 3: Identify the remaining pairs. Homohaptic ligands coordinate through identical donor atoms. Heterohaptic ligands coordinate through different donor atoms. Thus: \[ (i)-B,\quad (ii)-C,\quad (iii)-A,\quad (iv)-D \] Final Matching \[ \boxed{ (i)-B,\; (ii)-C,\; (iii)-A,\; (iv)-D } \]