What is not true about `POCl_3`?

Options

A. The molecule does not contain `p pi -p pi `bond
B. The molecule contain three sigma bond
C. The molecules contain `p pi - p pi ` bond
D. The molecule contain `p pi -d pi ` bond

Explanation

To determine what is not true about POCl₃, we need to analyze the structure and bonding of the molecule. Here’s a step-by-step breakdown:

### Step 1: Understanding the Structure of POCl₃
POCl₃ (phosphoryl chloride) consists of one phosphorus (P) atom, one oxygen (O) atom, and three chlorine (Cl) atoms. The phosphorus atom is in the +5 oxidation state.

### Step 2: Drawing the Lewis Structure
- The phosphorus atom forms a double bond with the oxygen atom (P=O).
- Phosphorus also forms single bonds with each of the three chlorine atoms (P-Cl).
- The overall structure can be represented as:
```
Cl
|
Cl-P=O
|
Cl
```

### Step 3: Analyzing the Bonds
- In POCl₃, phosphorus forms:
- One double bond (P=O) with oxygen.
- Three single bonds (P-Cl) with chlorine.
- The molecule has a total of four bonds: one double bond and three single bonds.

### Step 4: Identifying the Types of Bonds
- The P=O bond is a double bond, which includes one sigma (σ) bond and one pi (π) bond.
- The P-Cl bonds are all single bonds (σ bonds).
- There are no P-P or P-Pi bonds in POCl₃.

### Step 5: Evaluating Statements About POCl₃
Now, we can evaluate the statements regarding POCl₃:
1. The molecule contains P pi D pi bond. (True)
2. The molecule contains P pi P pi bond. (Not true)
3. The molecule contains 3 sigma bonds. (True, but this is misleading as it doesn't account for the double bond)
4. The molecule contains P=O bond. (True)

### Conclusion
The statement that is **not true** about POCl₃ is that it contains P pi P pi bonds.