Question

Match Column-I with Column-II: \[ \begin{array}{ll} \textbf{Column-I} & \textbf{Column-II}\\ A.\ \text{Homoleptic} & I.\ \text{Complex containing different ligands}\\ B.\ \text{Heteroleptic} & II.\ \text{Ligand having two donor atoms}\\ C.\ \text{Hexadentate} & III.\ \text{Complex containing only one type of ligand}\\ D.\ \text{Bidentate} & IV.\ \text{Ligand having six donor atoms} \end{array} \]

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

Hint:

Remember the following definitions: \[ \boxed{ \begin{aligned} \text{Homoleptic} &\rightarrow \text{One type of ligand}\\ \text{Heteroleptic} &\rightarrow \text{Different ligands}\\ \text{Bidentate} &\rightarrow \text{Two donor atoms}\\ \text{Hexadentate} &\rightarrow \text{Six donor atoms (EDTA)} \end{aligned} } \] These definitions are frequently tested in Coordination Chemistry.

Answer 1

The Correct Option is A

Concept: Ligands and coordination compounds are classified according to the number and type of donor atoms. Important definitions are:

• Homoleptic complex – contains only one kind of ligand.

• Heteroleptic complex – contains two or more different kinds of ligands.

• Bidentate ligand – has two donor atoms.

• Hexadentate ligand – has six donor atoms.

Step 1: Match Homoleptic and Heteroleptic complexes.
A homoleptic complex contains only one type of ligand. Hence, \[ \boxed{A\rightarrow III.} \] A heteroleptic complex contains different kinds of ligands. Hence, \[ \boxed{B\rightarrow I.} \]

Step 2: Match denticity of ligands.
A hexadentate ligand has six donor atoms. For example, \[ \boxed{\text{EDTA}.} \] Therefore, \[ \boxed{C\rightarrow IV.} \] A bidentate ligand has two donor atoms. For example, \[ \boxed{C_2O_4^{2-}} \] or ethylenediamine. Hence, \[ \boxed{D\rightarrow II.} \]

Step 3: Determine the correct matching.
Thus, \[ \boxed{ A-III,\; B-I,\; C-IV,\; D-II } \] which corresponds to \[ \boxed{\textbf{Option (A)}} \] according to the given options.