Each of the following hydrocarbon belongs to an alkane series except

Options

A. `C_(3)H_(8)`
B. `C_(4)H_(6)`
C. `CH_(4)`
D. `C_(5)H_(12)`

Explanation

To determine which hydrocarbon does not belong to the alkane series, we will use the general formula for alkanes, which is \( C_nH_{2n+2} \). This means that for every \( n \) carbon atoms, there should be \( 2n + 2 \) hydrogen atoms.

### Step-by-Step Solution:

1. **Identify the hydrocarbons**: We need to analyze each hydrocarbon provided in the question. Let's assume the hydrocarbons given are:
- A) \( C_3H_8 \)
- B) \( C_4H_6 \)
- C) \( CH_4 \)
- D) \( C_5H_{12} \)

2. **Check each hydrocarbon against the alkane formula**:
- **For \( C_3H_8 \)**:
- Calculate the expected number of hydrogen atoms:
\[ H = 2(3) + 2 = 6 + 2 = 8 \]
- Since \( C_3H_8 \) has 8 hydrogen atoms, it follows the alkane formula.

- **For \( C_4H_6 \)**:
- Calculate the expected number of hydrogen atoms:
\[ H = 2(4) + 2 = 8 + 2 = 10 \]
- Since \( C_4H_6 \) has only 6 hydrogen atoms, it does not follow the alkane formula.

- **For \( CH_4 \)**:
- Calculate the expected number of hydrogen atoms:
\[ H = 2(1) + 2 = 2 + 2 = 4 \]
- Since \( CH_4 \) has 4 hydrogen atoms, it follows the alkane formula.

- **For \( C_5H_{12} \)**:
- Calculate the expected number of hydrogen atoms:
\[ H = 2(5) + 2 = 10 + 2 = 12 \]
- Since \( C_5H_{12} \) has 12 hydrogen atoms, it follows the alkane formula.

3. **Conclusion**: The hydrocarbon that does not belong to the alkane series is \( C_4H_6 \).

### Final Answer:
The hydrocarbon that does not belong to the alkane series is **\( C_4H_6 \)**.