The most reactive hydrocarbon is

Options

A. ethene
B. ethyne
C. ethane
D. methane

Explanation

To determine the most reactive hydrocarbon from the given options (ethane, ethine, ethene, and methane), we need to understand the reactivity of different types of hydrocarbons based on their saturation levels.

### Step-by-Step Solution:

1. **Identify the Types of Hydrocarbons**:
- Hydrocarbons can be classified into three main categories based on their bonding:
- **Alkanes**: Saturated hydrocarbons with only single bonds (e.g., ethane, methane).
- **Alkenes**: Unsaturated hydrocarbons with at least one double bond (e.g., ethene).
- **Alkynes**: Unsaturated hydrocarbons with at least one triple bond (e.g., ethine).

2. **Understand Reactivity**:
- The reactivity of hydrocarbons generally increases with the degree of unsaturation:
- **Alkynes** (triple bonds) are the most reactive.
- **Alkenes** (double bonds) are less reactive than alkynes but more reactive than alkanes.
- **Alkanes** (single bonds) are the least reactive.

3. **Analyze the Given Options**:
- From the options provided:
- **Ethane (C2H6)**: An alkane (single bonds).
- **Ethene (C2H4)**: An alkene (double bond).
- **Ethine (C2H2)**: An alkyne (triple bond).
- **Methane (CH4)**: An alkane (single bonds).

4. **Determine the Most Reactive Hydrocarbon**:
- According to the order of reactivity:
- Ethine (alkyne) is the most reactive due to the presence of a triple bond.
- Ethene (alkene) is next in reactivity.
- Ethane and methane (alkanes) are the least reactive.

5. **Conclusion**:
- The most reactive hydrocarbon among the options is **Ethine (C2H2)**.

### Final Answer:
The most reactive hydrocarbon is **Ethine (C2H2)**.