Comproportionationn occurs between:

Options

A. `Cl^(-)(aq.)+ClO^(-)(aq.)+OH^(-)(aq.)`
B. `PH_(3)(g)+H_(3)PO_(4)` acid
C. `Na_(2)S(aq.)+Na_(2)SO_(3)(aq.)`
D. `MnO_(4)^(-)(aq.)+Mn^(2+)(aq.)+ZnSO_(4)(aq.)`

Explanation

To determine between which species a comproportionation reaction occurs, we need to analyze the oxidation states of the elements involved in the given options.

### Step-by-Step Solution:

1. **Understand Comproportionation Reaction**:
- A comproportionation reaction is a type of redox reaction where a single species in two different oxidation states reacts to form a product in a single oxidation state.

2. **Identify the Oxidation States**:
- We need to identify the oxidation states of the elements in the given compounds to see if they are present in two different oxidation states.

3. **Analyze Each Option**:
- **Option 1**: Cl in ClO- and Cl in another compound (not specified).
- In ClO-, Cl is in +1 oxidation state. If Cl is in -1 oxidation state in another compound, then this can be a candidate for comproportionation.
- **Option 2**: PH3 and H3PO4.
- In PH3, phosphorus (P) is in -3 oxidation state, while in H3PO4, P is in +5 oxidation state. This indicates two different oxidation states, but P in H3PO4 is stable and does not undergo a comproportionation reaction.
- **Option 3**: Sulfur in different compounds.
- For example, in H2S, sulfur is in -2 oxidation state and in SO4^2-, it is in +6 oxidation state. This does not lead to a comproportionation reaction since the sulfur does not transition to a stable oxidation state.
- **Option 4**: MnO4^- and Mn^2+.
- In MnO4^-, manganese (Mn) is in +7 oxidation state, while in Mn^2+, it is in +2 oxidation state. This indicates two different oxidation states, and it can undergo a comproportionation reaction.

4. **Conclusion**:
- The only pair of species that can undergo a comproportionation reaction is MnO4^- and Mn^2+ because they are in different oxidation states and can react to form a product with manganese in a single oxidation state.

### Final Answer:
- The comproportionation reaction occurs between MnO4^- and Mn^2+.