The products formed by complete hydrolysis of `PC l_(3)` are:

Options

A. `H_(3)PO_(3) and HC l`
B. `POCl_(3) and HCl`
C. `H_(3)PO_(4) and HCl`
D. `H_(4)P_(2)O_(7) and HCl`

Answer

To determine the products formed by the complete hydrolysis of phosphorus trichloride (PCl₃), we can follow these steps:

### Step 1: Understand the Reaction
Phosphorus trichloride (PCl₃) reacts with water (H₂O) during hydrolysis. The hydrolysis involves the substitution of chlorine atoms with hydroxyl groups (OH).

### Step 2: Write the Initial Reaction
The initial reaction can be represented as:
\[ \text{PCl}_3 + 3 \text{H}_2\text{O} \rightarrow \text{H}_3\text{PO}_3 + 3 \text{HCl} \]

### Step 3: Mechanism of Hydrolysis
1. **First Hydrolysis Step**:
- One water molecule attacks the phosphorus atom, leading to the release of one HCl molecule and the formation of a phosphorous oxychloride intermediate.
- Reaction:
\[ \text{PCl}_3 + \text{H}_2\text{O} \rightarrow \text{HCl} + \text{POCl}_2 \]

2. **Second Hydrolysis Step**:
- Another water molecule attacks the intermediate (POCl₂), releasing another HCl molecule.
- Reaction:
\[ \text{POCl}_2 + \text{H}_2\text{O} \rightarrow \text{HCl} + \text{PO(OH)Cl} \]

3. **Third Hydrolysis Step**:
- A final water molecule attacks the last chlorine atom, resulting in the formation of phosphorous acid (H₃PO₃) and the release of the last HCl molecule.
- Reaction:
\[ \text{PO(OH)Cl} + \text{H}_2\text{O} \rightarrow \text{HCl} + \text{H}_3\text{PO}_3 \]

### Step 4: Final Products
After complete hydrolysis, the final products are:
- Phosphorous acid (H₃PO₃)
- Hydrochloric acid (HCl)

### Conclusion
The products formed by the complete hydrolysis of PCl₃ are H₃PO₃ and HCl.

---