Which of the following ions does not have S-S linkage?

Options

A. `S_(2)O_(8)^(2-)`
B. `S_(2)O_(6)^(2-)`
C. `S_(2)O_(5)^(2-)`
D. `S_(2)O_(3)^(2-)`

Answer

To solve the question of which ion does not have an S-S linkage, we will analyze each of the given species step by step.

### Step 1: Analyze S2O8^2-
1. **Structure**: The structure of S2O8^2- involves two sulfur (S) atoms and eight oxygen (O) atoms.
2. **Linkage**: In this structure, the sulfur atoms are connected by a double bond (S=O) and are also linked through peroxy linkages (O-O).
3. **Conclusion**: There is no direct S-S linkage in S2O8^2-.

### Step 2: Analyze S2O6^2-
1. **Structure**: The structure of S2O6^2- includes two sulfur atoms and six oxygen atoms.
2. **Linkage**: In this case, there is a direct S-S linkage between the two sulfur atoms, along with double bonds to the oxygen atoms.
3. **Conclusion**: S2O6^2- contains an S-S linkage.

### Step 3: Analyze S2O5^2-
1. **Structure**: The structure of S2O5^2- consists of two sulfur atoms and five oxygen atoms.
2. **Linkage**: Similar to S2O6^2-, there is a direct S-S linkage present in this structure, along with double bonds to the oxygen atoms.
3. **Conclusion**: S2O5^2- contains an S-S linkage.

### Step 4: Analyze S2O3^2-
1. **Structure**: The structure of S2O3^2- includes two sulfur atoms and three oxygen atoms.
2. **Linkage**: Here, there is also a direct S-S linkage between the two sulfur atoms, with double bonds to the oxygen atoms.
3. **Conclusion**: S2O3^2- contains an S-S linkage.

### Final Conclusion
After analyzing all the species, we find that:
- **S2O8^2-** does not have an S-S linkage, while the other species (S2O6^2-, S2O5^2-, and S2O3^2-) do contain S-S linkages.

Therefore, the answer to the question is **S2O8^2-**.