Methane is the first member of the alkane series. It belongs to a group of compounds called aliphatic compounds. Among the hydrocarbons, it belongs to a group called paraffins. Methane being a paraffin, is not very reactive. It is the simplest hydrocarbon and the molecular formula of methane is `CH_(4)` . It is also called marsh gas because it is found bubbling in marshy places where it is produced by the bacterial decomposition of vegetable matters. It is found in natural gas. It is also produced when wood, peat and coal are dry distilled. It is also found in coal mines where it forms explosive mixture with air. It is called fire-damp by coal miners.
Which of the following is marsh gas?

Options

A. `CH_(4)`
B. `C_(2)H_(2)`
C. `C_(2)H_(4)`
D. `C_(3)H_(6)`

Answer

To determine which of the following is marsh gas, we need to identify the correct compound based on the information provided. Marsh gas is known to be methane, which has the molecular formula \( CH_4 \).

### Step-by-Step Solution:

1. **Identify the Definition of Marsh Gas**:
Marsh gas is commonly known as methane. It is produced through the bacterial decomposition of organic matter in marshy areas.

2. **Recall the Molecular Formula**:
The molecular formula for methane is \( CH_4 \). This means it consists of one carbon atom and four hydrogen atoms.

3. **Recognize the Characteristics of Methane**:
- Methane is the simplest hydrocarbon.
- It is classified as an alkane and is part of the group called paraffins, which are known for their low reactivity.

4. **Look for Options**:
If provided with multiple-choice options, we would look for the one that corresponds to the molecular formula \( CH_4 \) or is identified as methane.

5. **Conclusion**:
Based on the information, the correct answer to the question "Which of the following is marsh gas?" is the compound with the molecular formula \( CH_4 \), which is methane.