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 (CH₄), we will analyze each reaction step by step.

### Step 1: Understand Methane
Methane is a simple hydrocarbon with the chemical formula CH₄. It is important to identify reactions that yield this compound.

### Step 2: Analyze Reaction A
**Reaction A:** Sodium acetate (sodium salt of acetic acid) treated with soda lime (NaOH-CaO) and heated.

- **Process:** This reaction involves decarboxylation, where carbon dioxide (CO₂) is removed.
- **Expected Product:** When sodium acetate is heated with soda lime, it produces methane (CH₄) and carbon dioxide (CO₂).

**Conclusion:** This reaction produces methane.

### Step 3: Analyze Reaction B
**Reaction B:** Beryllium carbide (Be₂C) reacts with water upon heating.

- **Process:** Beryllium carbide reacts with water to produce acetylene (C₂H₂) and beryllium hydroxide (Be(OH)₂).
- **Expected Product:** The reaction does not yield methane but rather acetylene.

**Conclusion:** This reaction does not produce methane.

### Step 4: Analyze Reaction C
**Reaction C:** Aluminium carbide (Al₄C₃) reacts with water upon heating.

- **Process:** Aluminium carbide reacts with water to produce methane and aluminium hydroxide.
- **Expected Product:** The reaction produces 3 molecules of methane (CH₄) and aluminium hydroxide (Al(OH)₃).

**Conclusion:** This reaction produces methane.

### Step 5: Analyze Reaction D
**Reaction D:** This option states "all of these," which implies that all previous reactions produce methane.

- Since we have established that Reaction B does not produce methane, this option is incorrect.

### Final Conclusion
The reaction that will not give methane is **Reaction B** (Beryllium carbide with water).

### Summary of Results:
- **Reaction A:** Produces methane.
- **Reaction B:** Does not produce methane (correct answer).
- **Reaction C:** Produces methane.
- **Reaction D:** Incorrect since not all reactions produce methane.