Which of the following has S - S bond ?

Options

A. `H_(2)S_(2)O_(2)`
B. `H_(2)S_(2)O_(7)`
C. mustard gas
D. `H_(2)S_(2)O_(6)`

Answer

To determine which of the given compounds contains an S-S bond, we will analyze each option provided in the question. The options are H2S2, H2O7, H2O6, and mustard gas.

### Step-by-Step Solution:

1. **Identify the Compounds**:
- The compounds we need to analyze are:
- H2S2 (Dihydrogen disulfide)
- H2O7 (Dihydrogen heptasulfide)
- H2O6 (Dihydrogen hexasulfide)
- Mustard gas (C4H8Cl2S)

2. **Analyze H2S2**:
- H2S2 consists of two sulfur atoms. The structure can be represented as H-S-S-H.
- Here, there is a direct bond between the two sulfur atoms (S-S bond).
- **Conclusion**: H2S2 has an S-S bond.

3. **Analyze H2O7**:
- H2O7 is a compound that contains multiple sulfur atoms, but its structure does not indicate a direct S-S bond.
- The structure does not show any direct bonding between sulfur atoms.
- **Conclusion**: H2O7 does not have an S-S bond.

4. **Analyze H2O6**:
- H2O6 is similar in nature to H2S2. It consists of sulfur atoms, and the structure can be represented as H-S-S-H.
- This indicates that there is a direct S-S bond present.
- **Conclusion**: H2O6 has an S-S bond.

5. **Analyze Mustard Gas**:
- Mustard gas has the formula C4H8Cl2S.
- In this compound, there is only one sulfur atom present, which means there cannot be an S-S bond.
- **Conclusion**: Mustard gas does not have an S-S bond.

6. **Final Conclusion**:
- The compounds that contain an S-S bond are H2S2 and H2O6. Mustard gas and H2O7 do not contain S-S bonds.

### Final Answer:
The compounds that have an S-S bond are **H2S2** and **H2O6**.