The reagents that can be used convert benzenediazonium chloride to benzene are….

Options

A. `SnCl_(2)//HCl`
B. `CH_(3)CH_(2)OH`
C. `H_(3)PO_(2)`
D. `LiAlH_(4)`

Explanation

To convert benzenediazonium chloride to benzene, we need to identify suitable reagents that can provide a proton (H⁺) for the reaction. Here’s a step-by-step solution:

### Step 1: Understand the Structure of Benzenediazonium Chloride
Benzenediazonium chloride has the formula C₆H₅N₂Cl. It contains a diazonium group (N₂⁺) attached to a benzene ring.

### Step 2: Identify the Reaction
The conversion of benzenediazonium chloride to benzene involves the removal of the diazonium group and the addition of a proton (H⁺) to the benzene ring.

### Step 3: Determine Suitable Reagents
We need to find reagents that can provide H⁺ ions. Protic acids are suitable because they can donate protons.

### Step 4: Analyze Given Reagents
1. **SnCl₂ and HCl**: HCl is a protic acid, but in this context, it does not effectively provide H⁺ ions in solution. SnCl₂ is not a protic acid.
2. **Lithium Aluminum Hydride (LiAlH₄)**: This reagent provides hydride ions (H⁻) instead of protons (H⁺), so it cannot be used.
3. **Ethanol (C₂H₅OH)**: Ethanol is a protic acid and can donate H⁺ ions.
4. **Phosphorous Acid (H₃PO₂)**: This is also a protic acid and can donate H⁺ ions.

### Step 5: Conclusion
The reagents that can be used to convert benzenediazonium chloride to benzene are:
- Ethanol (C₂H₅OH)
- Phosphorous Acid (H₃PO₂)

### Final Answer
The reagents that can convert benzenediazonium chloride to benzene are ethanol and phosphorous acid.

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