`PCl_(5) overset(Delta)to PCl_(3)+Cl_(2)`

Options

A. For disproportionation reaction.
B. For comproportionation reaction.
C. For either intermolecular redox reaction or displacement reaction
D. For either thermal combination redox reaction or thermal decomposition redox reaction.

Answer

To analyze the reaction \( PCl_5 \overset{\Delta}{\rightarrow} PCl_3 + Cl_2 \), we will identify the type of reaction it represents.

### Step-by-Step Solution:

1. **Identify the Reactants and Products:**
- The reactant is phosphorus pentachloride (\( PCl_5 \)).
- The products are phosphorus trichloride (\( PCl_3 \)) and chlorine gas (\( Cl_2 \)).

2. **Determine the Nature of the Reaction:**
- The reaction involves the breakdown of one compound (\( PCl_5 \)) into two different products (\( PCl_3 \) and \( Cl_2 \)).
- This indicates that the reaction is a decomposition reaction.

3. **Classify the Reaction:**
- Decomposition reactions are characterized by a single reactant breaking down into two or more products.
- Since this reaction involves the breakdown of \( PCl_5 \) into \( PCl_3 \) and \( Cl_2 \), it can be classified as a thermal decomposition reaction, as it occurs upon heating (indicated by the delta symbol \( \Delta \)).

4. **Check for Redox Changes:**
- In this reaction, phosphorus in \( PCl_5 \) has an oxidation state of +5, while in \( PCl_3 \), it has an oxidation state of +3.
- Chlorine in \( PCl_5 \) has an oxidation state of -1, and in \( Cl_2 \), it has an oxidation state of 0.
- This indicates that there are changes in oxidation states, confirming that it is also a redox reaction.

5. **Conclusion:**
- Since the reaction involves the breakdown of a compound into two different products and involves changes in oxidation states, it is classified as a **decomposition redox reaction**.

### Final Answer:
The reaction \( PCl_5 \overset{\Delta}{\rightarrow} PCl_3 + Cl_2 \) is a **decomposition redox reaction**.

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