Which of the following compound can be used for the one step production of methane or ethane?

Options

A. `CH_3 Br`
B. `C_2H_5OH`
C. `CH_3 CHO`
D. None of these

Explanation

To solve the question of which compound can be used for the one-step production of methane or ethane, we will analyze each option provided.

### Step-by-Step Solution:

1. **Identify the Compounds**: The compounds given are CH3Br (methyl bromide), C2H5OH (ethanol), CH3CHO (acetaldehyde), and "none of these."

2. **Analyze CH3Br (Methyl Bromide)**:
- **Production of Methane**:
- CH3Br can react with nascent hydrogen (H) in the presence of a catalyst like zinc or copper, along with an acidic alcoholic solution (C2H5OH and HBr). This reaction produces methane (CH4).
- Reaction:
\[ CH_3Br + 2H \rightarrow CH_4 + HBr \]
- **Production of Ethane**:
- CH3Br can also react with sodium (Na) in the presence of dry ether. This reaction leads to the formation of ethane (C2H6).
- Reaction:
\[ 2CH_3Br + 2Na \rightarrow C_2H_6 + 2NaBr \]

3. **Analyze C2H5OH (Ethanol)**:
- Ethanol does not directly produce methane or ethane in a one-step reaction. It can undergo various reactions, but not in a straightforward manner to yield these alkanes.

4. **Analyze CH3CHO (Acetaldehyde)**:
- Acetaldehyde does not produce methane or ethane in a one-step reaction. It can undergo oxidation or reduction, but these processes are not direct one-step conversions to methane or ethane.

5. **Conclusion**:
- Among the given options, CH3Br is the only compound that can produce both methane and ethane in one step. Therefore, the correct answer is **CH3Br**.

### Final Answer:
The compound that can be used for the one-step production of methane or ethane is **CH3Br**.

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