Unsaturated hydrocarbon contains

Options

A. single and double bonds
B. only double bonds
C. only triple bonds
D. double and triple bonds

Answer

To solve the question about what unsaturated hydrocarbons contain, we can break it down step by step:

### Step-by-Step Solution:

1. **Definition of Hydrocarbons**:
- Hydrocarbons are organic compounds composed solely of hydrogen and carbon atoms. They are categorized into two main types: saturated and unsaturated hydrocarbons.

2. **Understanding Saturated Hydrocarbons**:
- Saturated hydrocarbons contain only single bonds between carbon atoms. They cannot undergo addition reactions. The general formula for saturated hydrocarbons (alkanes) is CnH2n+2. An example is ethane (C2H6).

3. **Understanding Unsaturated Hydrocarbons**:
- Unsaturated hydrocarbons contain at least one double or triple bond between carbon atoms. They can undergo addition reactions due to the presence of these multiple bonds.

4. **Types of Unsaturated Hydrocarbons**:
- Unsaturated hydrocarbons are further classified into two types:
- **Alkenes**: These contain at least one double bond (C=C). The general formula is CnH2n. An example is ethene (C2H4).
- **Alkynes**: These contain at least one triple bond (C≡C). The general formula is CnH2n-2. An example is ethyne (C2H2).

5. **Analyzing the Options**:
- Option 1: Single and double bonds - Incorrect, as unsaturated hydrocarbons cannot have single bonds.
- Option 2: Only double bonds - Incorrect, as unsaturated hydrocarbons can also have triple bonds.
- Option 3: Only triple bonds - Incorrect, as unsaturated hydrocarbons can also have double bonds.
- Option 4: Double and triple bonds - Correct, as unsaturated hydrocarbons can contain both types of multiple bonds.

6. **Conclusion**:
- Therefore, the correct answer is that unsaturated hydrocarbons contain double and triple bonds.

### Final Answer:
Unsaturated hydrocarbons contain double and triple bonds.