If the molecular formula of an organic compound is `C_(2)H_(2)` it is :

Options

A. alkene
B. alkane
C. alkyne
D. not a hydrocarbon

Explanation

To determine the classification of the organic compound with the molecular formula \( C_2H_2 \), we can analyze it based on the general formulas for different types of hydrocarbons.

### Step-by-Step Solution:

1. **Identify the General Formulas**:
- **Alkane**: The general formula is \( C_nH_{2n+2} \).
- **Alkene**: The general formula is \( C_nH_{2n} \).
- **Alkyne**: The general formula is \( C_nH_{2n-2} \).

2. **Determine the Value of \( n \)**:
- For the given molecular formula \( C_2H_2 \), we can identify \( n \) by comparing it with the general formulas.
- Here, \( n = 2 \) (since there are 2 carbon atoms).

3. **Substitute \( n \) into the General Formulas**:
- **For Alkane**:
\[ C_nH_{2n+2} = C_2H_{2(2)+2} = C_2H_6 \quad \text{(not matching)} \]
- **For Alkene**:
\[ C_nH_{2n} = C_2H_{2(2)} = C_2H_4 \quad \text{(not matching)} \]
- **For Alkyne**:
\[ C_nH_{2n-2} = C_2H_{2(2)-2} = C_2H_2 \quad \text{(matching)} \]

4. **Conclusion**:
- Since the molecular formula \( C_2H_2 \) matches the general formula for an alkyne, we can conclude that the compound is an alkyne.

5. **Structure of the Compound**:
- The structure of \( C_2H_2 \) (ethyne or acetylene) consists of a carbon-carbon triple bond with two hydrogen atoms attached to the carbon atoms.

### Final Answer:
The organic compound with the molecular formula \( C_2H_2 \) is an **alkyne**.

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