`{:(,"List - I","List - II"),(,"(P)" CH_(3)COCl , (1) "Epoxidation reagent"),(,"(Q)" C_(6)H_(5)COCl, (2) "Acetylating agent"),(,"(R)" CH_(3)l , (3) "Benzoylating agent"),(,"(S)" CH_(3)COOOH,(4)"Methylating agent"):}`

Options

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

Answer

To solve the question, we need to match the reagents from List - I with their corresponding types from List - II based on their chemical properties and reactions.

### Step-by-Step Solution:

1. **Identify Reagent P: CH₃COCl (Acetyl Chloride)**
- This compound contains an acetyl group (CH₃C=O).
- When reacted with benzene in the presence of a Lewis acid (like AlCl₃), it undergoes Friedel-Crafts acylation to form an acetophenone.
- Therefore, CH₃COCl is an **acetylating agent**.
- **Match:** P → (2) Acetylating agent.

2. **Identify Reagent Q: C₆H₅COCl (Benzoyl Chloride)**
- This compound contains a benzoyl group (C₆H₅C=O).
- Similar to the previous reaction, when benzoyl chloride is reacted with benzene in the presence of AlCl₃, it yields a benzophenone.
- Thus, C₆H₅COCl is a **benzoylating agent**.
- **Match:** Q → (3) Benzoylating agent.

3. **Identify Reagent R: CH₃I (Methyl Iodide)**
- This compound is a simple methyl halide.
- It can act as a methylating agent in reactions where it provides a methyl group (CH₃) to other nucleophiles.
- Therefore, CH₃I is a **methylating agent**.
- **Match:** R → (4) Methylating agent.

4. **Identify Reagent S: CH₃COOOH (Peracetic Acid)**
- This compound is a peracid and can be used in epoxidation reactions.
- It reacts with alkenes to form epoxides, hence it is classified as an **epoxidation reagent**.
- **Match:** S → (1) Epoxidation reagent.

### Final Matches:
- P → (2) Acetylating agent
- Q → (3) Benzoylating agent
- R → (4) Methylating agent
- S → (1) Epoxidation reagent

### Summary of Matches:
- P: CH₃COCl → (2) Acetylating agent
- Q: C₆H₅COCl → (3) Benzoylating agent
- R: CH₃I → (4) Methylating agent
- S: CH₃COOOH → (1) Epoxidation reagent