Question

Given below are two statements :
Statement I : [Co(NH₃)₆] ³⁺ is a homoleptic complex whereas [Co(NH₃)4Cl₂] ⁺ is a heteroleptic complex. 
Statement II : Complex [Co(NH₃)₆] ³⁺ has only one kind of ligands but [Co(NH₃)₄Cl₂] ⁺ has more than one kind of ligands. 
In the light of the above statements, choose the correct answer from the options given below

• A. Both Statement I and Statement II are true
• B. Both Statement I and Statement II are false
• C. Statement I is true but Statement II is false
• D. Statement I is false but Statement II is true

Answer 1

The Correct Option is A

To comprehend the given statements, let's first define some essential terms in coordination chemistry:

• Homoleptic Complex: A complex compound where the central metal ion is coordinated with only one type of ligand.
• Heteroleptic Complex: A complex compound where the central metal ion is coordinated with more than one type of ligand.

Now evaluate the given cobalt complexes:

• Statement I Analysis: 
  The complex [Co(NH₃)₆]³⁺ has six ammine (NH₃) ligands, all of which are the same type, making it a homoleptic complex. 
  Conversely, [Co(NH₃)₄Cl₂]⁺ contains both ammine (NH₃) and chloride (Cl^-) ligands, making it heteroleptic. Thus, Statement I is true.
• Statement II Analysis: 
  Complex [Co(NH₃)₆]³⁺ indeed contains only one kind of ligand (NH₃), affirming the statement. 
  Meanwhile, the complex [Co(NH₃)₄Cl₂]⁺ includes two types of ligands: NH₃ and Cl^-. Therefore, Statement II is also true.

Hence, the correct choice is: Both Statement I and Statement II are true.