The heteroleptic complexe (s) is/are:

Options

A. `[Co(NH_(3))_(6)]Cl_(3)`
B. `[Co(NH_(3))_(4)(ONO)_(3)]`
C. `[Cr(NH_(3))_(4)(Cl)_(3)]^(+)`
D. Both (b) and (c )

Explanation

To determine which complexes are heteroleptic, we first need to understand the definition of heteroleptic complexes. Heteroleptic complexes are those in which the central metal ion is coordinated to more than one type of ligand. In contrast, homoleptic complexes contain only one type of ligand surrounding the metal ion.

### Step-by-Step Solution:

1. **Identify the Definition**:
- Heteroleptic complexes have multiple types of ligands attached to the central metal ion.
- Homoleptic complexes have only one type of ligand.

2. **Analyze the Given Complexes**:
- Look at the ligands attached to the central metal ion in each complex provided in the question.

3. **Example Analysis**:
- For example, if we have a complex like [Pt(NH3)Cl2], we see that platinum (Pt) is coordinated to two different types of ligands: ammonia (NH3) and chloride (Cl). This makes it a heteroleptic complex.
- In contrast, a complex like [Fe(CN)6]4- has only cyanide (CN) ligands, making it a homoleptic complex.

4. **Identify Heteroleptic Complexes**:
- From the examples analyzed, identify which complexes contain more than one type of ligand.
- For instance, if you have complexes B and C that have different ligands, then those are heteroleptic.

5. **Conclusion**:
- The complexes that are heteroleptic are those where the central metal ion is surrounded by different types of ligands.

### Final Answer:
The heteroleptic complexes are those that contain multiple types of ligands, such as the complexes B and C mentioned in the analysis.