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

Options

A. `H_(2)S_(2)O_(5)`
B. `H_(2)S_(2)O_(7)`
C. `H_(2)S_(2)O_(3)`
D. `H_(2)S_(2)O_(6)`

Answer

To determine which of the given compounds does not have an S-S linkage, we will analyze the structures of each compound step by step.

### Step 1: Analyze H2S2O5
- The molecular formula is H2S2O5.
- The structure can be drawn as follows:
- S double bond O
- S double bond O
- OH group attached to each sulfur atom.
- In this structure, we can see that there is an S-S linkage between the two sulfur atoms.

### Step 2: Analyze H2S2O7
- The molecular formula is H2S2O7.
- The structure can be drawn as follows:
- S double bond O
- S double bond O
- O group connecting the two sulfur atoms.
- In this structure, there is no direct S-S linkage; instead, there is an S-O-S linkage.

### Step 3: Analyze H2S2O3
- The molecular formula is H2S2O3.
- The structure can be drawn as follows:
- S double bond O
- S double bond O
- OH group attached to each sulfur atom.
- In this structure, there is an S-S linkage between the two sulfur atoms.

### Step 4: Analyze H2S2O6
- The molecular formula is H2S2O6.
- The structure can be drawn as follows:
- S double bond O
- S double bond O
- OH group attached to each sulfur atom.
- In this structure, there is an S-S linkage between the two sulfur atoms.

### Conclusion
After analyzing all the compounds, we find that:
- **H2S2O5** has S-S linkage.
- **H2S2O7** does not have S-S linkage (it has S-O-S linkage).
- **H2S2O3** has S-S linkage.
- **H2S2O6** has S-S linkage.

Thus, the compound that does not have an S-S linkage is **H2S2O7**.

### Final Answer
The correct option is **H2S2O7**.

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