Which of the following is a homocyclic alicyclic compound?

Options

A.
B.
C.
D.

Answer

To determine which of the given compounds is a homocyclic alicyclic compound, we need to understand the definitions of homocyclic and alicyclic compounds.

### Step-by-Step Solution:

1. **Understanding Alicyclic Compounds**:
- Alicyclic compounds are organic compounds that are both aliphatic and cyclic. They can be either saturated (like cyclohexane) or unsaturated (like cyclohexene), but they cannot be aromatic.

2. **Understanding Homocyclic Compounds**:
- Homocyclic compounds are those that contain rings made up entirely of carbon atoms. For example, cyclobutane (C4H8) is a homocyclic compound because it consists of a ring of four carbon atoms.

3. **Identifying Heterocyclic Compounds**:
- If a ring contains atoms other than carbon (like oxygen, nitrogen, or sulfur), it is classified as a heterocyclic compound. For example, a compound with a ring containing both carbon and oxygen would be heterocyclic.

4. **Analyzing the Given Options**:
- We need to evaluate each option provided to see if it meets the criteria for being a homocyclic alicyclic compound:
- **Option 1**: Contains a ring with both carbon and oxygen. This is heterocyclic, so it is not homocyclic.
- **Option 2**: Contains a ring made up entirely of carbon atoms (e.g., cyclobutane). This is homocyclic and alicyclic, so it is a valid option.
- **Option 3**: Contains a ring with an oxygen atom. This is also heterocyclic and not homocyclic.
- **Option 4**: Contains a ring with a sulfur atom. This is heterocyclic as well and not homocyclic.

5. **Conclusion**:
- The only compound that qualifies as a homocyclic alicyclic compound is the one that consists solely of carbon atoms in its ring structure (e.g., cyclobutane).

### Final Answer:
The homocyclic alicyclic compound from the given options is **cyclobutane**.