When ethanol reacts with `PCl_(5)` it gives three products which include chloroethane and hydrochloric acid. What is the third product?

Options

A. Phosphorus acid
B. Phosphoric acid
C. Phosphorus trichloride
D. Phosphoryl chloride

Explanation

To solve the problem, we need to analyze the reaction between ethanol (C2H5OH) and phosphorus pentachloride (PCl5) to identify the products formed.

### Step-by-Step Solution:

1. **Identify the Reactants**:
- The reactants in this reaction are ethanol (C2H5OH) and phosphorus pentachloride (PCl5).

2. **Understand the Reaction**:
- When ethanol reacts with PCl5, it undergoes a substitution reaction where the hydroxyl (-OH) group of ethanol is replaced by a chlorine atom.

3. **Determine the First Product**:
- The first product formed is chloroethane (C2H5Cl), which is the alkyl halide resulting from the substitution of the -OH group by a Cl atom.

4. **Determine the Second Product**:
- The second product formed is hydrochloric acid (HCl), which is produced as a byproduct when the chlorine replaces the hydroxyl group.

5. **Identify the Third Product**:
- The third product is phosphoryl chloride (POCl3). This compound is formed when the remaining phosphorus and chlorine atoms from PCl5 react with the ethanol.

6. **Summarize the Products**:
- Therefore, the three products formed when ethanol reacts with PCl5 are:
1. Chloroethane (C2H5Cl)
2. Hydrochloric acid (HCl)
3. Phosphoryl chloride (POCl3)

### Final Answer:
The third product is phosphoryl chloride (POCl3).

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