Which of the following is not used for industrial prepa-ration of methanol ?

Options

A. `CH_(4)`
B. CO
C. `H_(2)`
D. Wood

Answer

To determine which of the following options is not used for the industrial preparation of methanol, we need to analyze the methods commonly employed in the industry for methanol synthesis.

### Step-by-Step Solution:

1. **Identify Common Methods for Methanol Production**:
- Methanol (CH3OH) can be produced through various methods, including:
- **From Carbon Monoxide (CO)**: This is done via hydrogenation, where CO reacts with hydrogen in the presence of a catalyst (like ZnO) at high temperature and pressure.
- **From Natural Gas (Methane, CH4)**: Methane can be converted to methanol through oxidation processes.
- **From Biomass (Wood)**: Wood can be pyrolyzed to produce methanol through a series of reactions involving heating and treatment with acetic acid.

2. **Analyze the Given Options**:
- If the options include substances like CO, CH4, or wood, these are all used in the industrial preparation of methanol.
- However, if an option like **Hydrogen (H2)** is present, it is important to note that while hydrogen is essential in many reactions, it is not directly used to produce methanol without the presence of CO.

3. **Conclusion**:
- The substance that is **not used** for the industrial preparation of methanol is **Hydrogen (H2)**, as it does not directly yield methanol without the presence of carbon monoxide or other carbon sources.

### Final Answer:
**Hydrogen (H2)** is not used for the industrial preparation of methanol.

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