The example of alkyne is

Options

A. `C_3H_4`
B. `C_3H_8`
C. `C_5 H_(10)`
D. `C_3 H_6`

Explanation

To determine an example of an alkyne from the given options, we need to understand the characteristics of alkynes. Alkynes are hydrocarbons that contain at least one carbon-carbon triple bond. The general formula for alkynes is CnH2n-2, where 'n' is the number of carbon atoms.

### Step-by-Step Solution:

1. **Identify the General Formula**:
The general formula for alkynes is CnH2n-2. This means for every 'n' carbon atoms, there are '2n-2' hydrogen atoms.

2. **Analyze Each Option**:
We will check each of the given options to see if they fit the alkyne formula.

3. **Option 1: C3H4**:
- Here, n = 3.
- According to the formula: H = 2(3) - 2 = 6 - 2 = 4.
- This matches C3H4, so this is a valid alkyne.

4. **Option 2: C3H8**:
- Here, n = 3.
- According to the formula: H = 2(3) - 2 = 6 - 2 = 4.
- This does not match C3H8 (which has 8 hydrogens), so this is not an alkyne.

5. **Option 3: C5H8**:
- Here, n = 5.
- According to the formula: H = 2(5) - 2 = 10 - 2 = 8.
- This matches C5H8, but we need to ensure that it fits the alkyne structure. Since it has 5 carbons and follows the formula, it can be an alkyne, but we are looking for a specific example.

6. **Conclusion**:
From the analysis, the only option that fits the definition of an alkyne based on the general formula is **C3H4**. This compound is known as **propine**.

### Final Answer:
The example of an alkyne is **C3H4** (Propine).