The constituents of coal gas are

Options

A. methane ,ethane and hydrogen
B. ethance carbon monoxide and hydrogen
C. methane ,ethane and carbon monoxide
D. methane ,carbon monoxide and hydrogen

Explanation

To determine the constituents of coal gas, let's analyze the options provided and the information given in the video transcript.

### Step-by-Step Solution:

1. **Identify the Main Constituents of Coal Gas**:
- According to the video transcript, the main constituents of coal gas are:
- Methane (CH₄)
- Carbon Monoxide (CO)
- Hydrogen (H₂)

2. **Analyze the Percentage Composition**:
- The video states that:
- Methane constitutes approximately 35% of coal gas.
- Carbon Monoxide constitutes about 10%.
- Hydrogen constitutes around 50%.
- This indicates that these three gases are the primary components of coal gas.

3. **Consider Other Components**:
- The transcript mentions that coal gas may also contain other substances such as Carbon Dioxide (CO₂) and Nitrogen (N₂), but these are not the main constituents.

4. **Evaluate the Options**:
- Option A: Methane, Ethane, and Hydrogen - **Incorrect** (Ethane is not a main constituent).
- Option B: Ethane, Carbon Monoxide, and Hydrogen - **Incorrect** (Ethane is not a main constituent).
- Option C: Methane, Ethane, and Carbon Monoxide - **Incorrect** (Ethane is not a main constituent).
- Option D: Methane, Carbon Monoxide, and Hydrogen - **Correct** (These are the main constituents).

5. **Conclusion**:
- The correct answer is **Option D: Methane, Carbon Monoxide, and Hydrogen**.