METHANOL is not prepared by

Options

A. Destructive distillation of wood
B. Catalytic hydrogenation of carbon monoxide
C. Catalytic oxidation of methane
D. Hydroboration-oxidation of ethylene

Answer

To determine which method does not prepare methanol, we will analyze each of the four given processes step by step.

### Step 1: Destructive Distillation of Wood
- **Explanation**: This process involves heating wood in the absence of air, leading to its decomposition. The products include various chemicals, including methanol.
- **Conclusion**: Methanol can be prepared from this method.

### Step 2: Catalytic Hydrogenation of Carbon Monoxide
- **Explanation**: In this method, carbon monoxide (CO) reacts with hydrogen (H2) in the presence of a catalyst (like zinc oxide and chromium oxide) under high temperature and pressure to produce methanol.
- **Conclusion**: Methanol can be prepared from this method.

### Step 3: Catalytic Oxidation of Methane
- **Explanation**: Methane (CH4) reacts with oxygen (O2) in the presence of a catalyst (such as copper) at elevated temperatures to produce methanol.
- **Conclusion**: Methanol can be prepared from this method.

### Step 4: Hydroboration Oxidation of Ethylene
- **Explanation**: Ethylene (C2H4) undergoes hydroboration with diborane (B2H6) followed by oxidation. This process leads to the formation of ethanol (C2H5OH), not methanol.
- **Conclusion**: This method does not produce methanol; it produces ethanol instead.

### Final Answer
Methanol is not prepared by **hydroboration oxidation of ethylene**.

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