Which of the following compound had a P-P bond ?

Options

A. `H_(4)P_(2)O_(5)`
B. `(HPO_3)_(3)`
C. `H_(4)P_(2)O_(6)`
D. `H_(4)P_(2)O_(7)`

Explanation

To determine which of the given compounds has a P-P bond, we need to analyze the structures of the compounds listed in the question. The compounds are:

1. H4P2O5
2. H2O3
3. H4P2O6
4. H4P2O7

Let’s go through each compound step by step.

### Step 1: Analyze H4P2O5 (Pyrophosphoric Acid)
- The structure of H4P2O5 can be represented as:
- P-O-P with double bonds to oxygen and hydroxyl groups.
- In this structure, there is no P-P bond present.

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

### Step 2: Analyze H2O3 (Tri-Meta-Phosphoric Acid)
- The structure of H2O3 can be represented as:
- P=O, P-OH, and P=O.
- In this structure, there is also no P-P bond present.

**Hint:** Check if the phosphorus atoms are connected directly to each other.

### Step 3: Analyze H4P2O6 (Hypophosphoric Acid)
- The structure of H4P2O6 can be represented as:
- P-P with double bonds to oxygen and hydroxyl groups.
- Here, we can see that there is a direct P-P bond present.

**Hint:** Look for a direct bond between two phosphorus atoms in the structure.

### Step 4: Analyze H4P2O7 (Pyrophosphoric Acid)
- The structure of H4P2O7 can be represented as:
- P-O-P with double bonds to oxygen and hydroxyl groups.
- In this structure, there is no P-P bond present.

**Hint:** Again, confirm if phosphorus atoms are connected directly.

### Conclusion
After analyzing all the compounds, we find that the only compound with a P-P bond is **H4P2O6** (Hypophosphoric Acid).

### Final Answer
The compound that has a P-P bond is **H4P2O6**.