`{:(,"List-I",,"List-II"),((P),FeSO_(4)//H_(2)O_(2),(1),"Power alcohol"),((Q),ZnCl_(2)//conc.HCl,(2),"Enzyme"),((R),"Zymase",(3),"Fenton reagent"),((S),"Petrol/"C_(2)H_(5)OH,(4),"Lucas reagent"):}`

Options

A. `{:("P","Q","R","S"),(1,2,3,4):}`
B. `{:("P","Q","R","S"),(4,3,2,1):}`
C. `{:("P","Q","R","S"),(3,4,1,2):}`
D. `{:("P","Q","R","S"),(3,4,2,1):}`

Answer

To solve the matching question between List-I and List-II, we will analyze each item in List-I and find its corresponding match in List-II based on the descriptions provided.

### Step-by-Step Solution:

1. **Identify P: FeSO4/H2O2**
- The combination of FeSO4 (ferrous sulfate) and H2O2 (hydrogen peroxide) is known as the **Fenton reagent**. It is commonly used in organic chemistry for oxidation reactions.
- **Match:** P → (3) Fenton reagent

2. **Identify Q: ZnCl2/conc.HCl**
- The combination of ZnCl2 (zinc chloride) and concentrated HCl is referred to as the **Lucas reagent**. This reagent is used to differentiate between primary, secondary, and tertiary alcohols.
- **Match:** Q → (4) Lucas reagent

3. **Identify R: Zymase**
- Zymase is a complex of enzymes that catalyzes the fermentation of sugars into ethanol and carbon dioxide. Thus, it is classified as an **enzyme**.
- **Match:** R → (2) Enzyme

4. **Identify S: Petrol/C2H5OH**
- The mixture of petrol (gasoline) and ethanol (C2H5OH) is commonly known as **power alcohol**. This mixture is used as a fuel for engines.
- **Match:** S → (1) Power alcohol

### Final Matches:
- P → (3) Fenton reagent
- Q → (4) Lucas reagent
- R → (2) Enzyme
- S → (1) Power alcohol

### Conclusion:
The correct matching of List-I with List-II is:
- P → 3
- Q → 4
- R → 2
- S → 1