Which of the following reaction will not give methane?

Options

A. `CH_(3)COONa overset(NaOH + CaO)underset(Delta)to`
B. `BeC_(2) + H_(2)O overset(Delta)to`
C. `Al_(4)C_(3) + H_(2)O overset(Delta)to`
D. All of those

Answer

To determine which of the following reactions will not produce methane, we will analyze each option step by step.

### Step-by-Step Solution:

1. **Identify the Reactions**: We have three reactions to analyze:
- Sodium acetate with soda lime.
- Beryllium carbide with water.
- Aluminum carbide with water.

2. **Reaction of Sodium Acetate with Soda Lime**:
- Sodium acetate (CH₃COONa) is heated with soda lime (a mixture of NaOH and CaO).
- This process involves decarboxylation, where the carboxylic acid group is removed, releasing carbon dioxide (CO₂).
- The reaction can be represented as:
\[ \text{CH}_3\text{COONa} + \text{NaOH} \xrightarrow{\Delta} \text{CH}_4 + \text{CO}_2 \]
- **Conclusion**: This reaction produces methane (CH₄).

3. **Reaction of Beryllium Carbide with Water**:
- Beryllium carbide (Be₂C) reacts with water (H₂O).
- The reaction produces acetylene (C₂H₂) and beryllium hydroxide (Be(OH)₂).
- The reaction can be represented as:
\[ \text{Be}_2\text{C} + 2\text{H}_2\text{O} \rightarrow \text{C}_2\text{H}_2 + \text{Be(OH)}_2 \]
- **Conclusion**: This reaction does not produce methane; it produces acetylene instead.

4. **Reaction of Aluminum Carbide with Water**:
- Aluminum carbide (Al₄C₃) reacts with water.
- The reaction produces methane and aluminum hydroxide (Al(OH)₃).
- The reaction can be represented as:
\[ \text{Al}_4\text{C}_3 + 12\text{H}_2\text{O} \rightarrow 3\text{CH}_4 + 4\text{Al(OH)}_3 \]
- **Conclusion**: This reaction produces methane (CH₄).

5. **Final Decision**:
- From the analysis:
- Sodium acetate with soda lime produces methane.
- Beryllium carbide with water does not produce methane.
- Aluminum carbide with water produces methane.
- Therefore, the reaction that will not give methane is the reaction of **Beryllium carbide with water**.

### Answer:
The reaction that will not give methane is **Beryllium carbide with water**.

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