Which of the following compound does not have only one type of hybrid carbon atoms?

Options

A. `HC-= C - C -= CH`
B. `CH_3 - CH_2 - CH_2 - CH_3`
C. `CH_3 - C -= C - CH_3`
D. `CH_2 = CH - CH = CH_2`

Answer

To determine which compound does not have only one type of hybrid carbon atoms, we need to analyze the hybridization of carbon atoms in each compound provided.

### Step-by-Step Solution:

1. **Understanding Hybridization**:
- Carbon can exhibit different types of hybridization based on the number of sigma bonds it forms:
- **SP Hybridization**: 2 sigma bonds (linear geometry)
- **SP2 Hybridization**: 3 sigma bonds (trigonal planar geometry)
- **SP3 Hybridization**: 4 sigma bonds (tetrahedral geometry)

2. **Analyzing Each Compound**:
- For each compound, we will identify the number of sigma bonds formed by the carbon atoms to determine their hybridization.

3. **Compound 1**:
- If all carbon atoms in this compound form 2 sigma bonds, they are all SP hybridized.
- If they form 3 or 4 sigma bonds, they are SP2 or SP3 hybridized, respectively.
- **Conclusion**: If all carbons are SP hybridized, this option does not meet the criteria.

4. **Compound 2**:
- If the carbon atoms here form 4 sigma bonds (2 with carbon and 2 with hydrogen), they are SP3 hybridized.
- If they form 3 sigma bonds (1 with carbon and 2 with hydrogen), they are SP2 hybridized.
- **Conclusion**: If all carbons are SP3 hybridized, this option does not meet the criteria.

5. **Compound 3**:
- If one carbon atom forms 4 sigma bonds (SP3) and another forms 2 sigma bonds (SP), this indicates different hybridizations.
- **Conclusion**: This compound has different types of hybridization, making it the correct answer.

6. **Compound 4**:
- If all carbon atoms form 3 sigma bonds, they are all SP2 hybridized.
- **Conclusion**: This option does not meet the criteria as all carbons are of the same type.

### Final Answer:
The compound that does not have only one type of hybrid carbon atoms is **Compound 3**.