Among the following compounds of phosphorus:
`H_(4)P_(2)O_(6), P_(2)O_(5), P_(4)O_(6), P_(4)O_(10)`.
The compounds having P-O-P bond is(are):

Options

A. All except `H_(4)P_(2)O_(6)`
B. Only `P_(4)O_(10), P_(4)O_(6), H_(4)P_(2)O_(6)`
C. Only `P_(2)O_(5), P_(4)O_(10), H_(4)P_(2)O_(6)`
D. All four compounds

Explanation

To determine which of the given phosphorus compounds have P-O-P bonds, we will analyze the structures of each compound step by step.

### Step 1: Analyze H4P2O6
- The structure of H4P2O6 can be represented as:
```
O
||
H-O-P-OH
|
P=O
|
OH
```
- In this structure, there are no P-O-P bonds present. The phosphorus atoms are connected to oxygen atoms through double bonds and hydroxyl groups.

**Hint:** Look for direct connections between phosphorus atoms through oxygen in the structure.

### Step 2: Analyze P2O5
- The structure of P2O5 can be represented as:
```
O
||
O=P-O-P=O
||
O
```
- In this structure, there are no P-O-P bonds. The phosphorus atoms are connected through double bonds to oxygen.

**Hint:** Check if phosphorus atoms are connected through single bonds to oxygen, which would indicate a P-O-P bond.

### Step 3: Analyze P4O6
- The structure of P4O6 can be represented as:
```
O
|
O-P-O-P-O-P-O-P=O
|
O
```
- In this structure, there are P-O-P bonds present between the phosphorus atoms.

**Hint:** Identify any segments where phosphorus atoms are connected through oxygen atoms.

### Step 4: Analyze P4O10
- The structure of P4O10 can be represented as:
```
O
|
O-P-O-P-O-P-O-P=O
|
O
```
- Similar to P4O6, this structure also contains P-O-P bonds between the phosphorus atoms.

**Hint:** Look for multiple connections between phosphorus atoms through oxygen in the structure.

### Conclusion
Based on the analysis:
- H4P2O6: No P-O-P bonds
- P2O5: No P-O-P bonds
- P4O6: Contains P-O-P bonds
- P4O10: Contains P-O-P bonds

### Final Answer
The compounds that have P-O-P bonds are **P4O6 and P4O10**.