Match List-I with List-II
Choose the correct answer from the options given below:
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Key definitions:
- Ambidentate: has two donor atoms, but binds via only ONE atom at a time.
- Didentate: binds through two donor atoms.
- Chelate: binds through two or more donor atoms simultaneously to form a ring.
Concept:
The terminology of coordination chemistry is defined by standard IUPAC conventions that describe the central metal, types of ligands based on denticity, and the modes of coordination. Step 1: Matching Ambidentate Ligands:
An ambidentate ligand is a monodentate species that possesses two different potential donor atoms, but coordinates through only one donor atom at a time to the central metal.
Examples include \(-\text{NO}_2^-\) (which can bind through \(\text{N}\) or \(\text{O}\)) and \(-\text{SCN}^-\) (which can bind through \(\text{S}\) or \(\text{N}\)).
Therefore, (A) matches with (III). Step 2: Matching Central Atom or Ion:
In a coordination entity, the metal atom or cation to which a fixed number of neutral molecules or anions are bound in a definite geometrical arrangement is defined as the central atom or ion.
Therefore, (B) matches with (I). Step 3: Matching Chelate Ligands:
When a di- or polydentate ligand uses two or more of its donor atoms simultaneously to bind to the same central metal ion, it forms a cyclic ring structure known as a chelate ring, and the ligand is called a chelate ligand.
Therefore, (C) matches with (II). Step 4: Matching Didentate Ligands:
A ligand that coordinates to the central metal atom or ion through two donor atoms is termed a didentate (or bidentate) ligand, such as ethane-1,2-diamine or the oxalate ion.
Therefore, (D) matches with (IV). Final Answer:
The resulting matched sequence is (A)-(III), (B)-(I), (C)-(II), (D)-(IV), which corresponds to option (D).
