Acetic acid reacts with `PCl_(5)` to form

Options

A. `CH_(2)ClCOOH`
B. `CHCl_(2)COOH`
C. `CH_(2)COCl`
D. `CH_(3)COOCl`

Explanation

To determine the product formed when acetic acid reacts with phosphorus pentachloride (PCl5), we can follow these steps:

### Step 1: Identify the Reactants
The reactants in this reaction are acetic acid (CH3COOH) and phosphorus pentachloride (PCl5).

### Step 2: Understand the Reaction Mechanism
Phosphorus pentachloride is a chlorinating agent. It reacts with acetic acid by replacing the hydroxyl (OH) group of the carboxylic acid with a chlorine (Cl) atom.

### Step 3: Write the Reaction
The reaction can be written as follows:
\[ \text{CH}_3\text{COOH} + \text{PCl}_5 \rightarrow \text{CH}_3\text{COCl} + \text{POCl}_3 + \text{HCl} \]

### Step 4: Identify the Products
From the reaction, we can see that the primary product is acetyl chloride (CH3COCl), which is an acid chloride. Additionally, phosphorus oxychloride (POCl3) and hydrochloric acid (HCl) are formed as byproducts.

### Step 5: Conclusion
The main product of the reaction between acetic acid and phosphorus pentachloride is acetyl chloride (CH3COCl).

### Final Answer
The product formed when acetic acid reacts with PCl5 is **CH3COCl** (acetyl chloride).

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