Phosphine is not obtained by the reaction

Options

A. White P is heated with NaOH
B. Red P is heated with NaOH
C. `Ca_3 P_2` reacts with water
D. Phosphorus trioxide is boiled with water

Explanation

To determine which reaction does not produce phosphine (PH3), we can analyze the reactions involving phosphorus and its compounds. Here’s a step-by-step breakdown:

1. **Understanding Phosphine (PH3)**: Phosphine is a chemical compound consisting of phosphorus and hydrogen. It is important to know the common methods of synthesizing phosphine.

2. **Reactions that Produce Phosphine**:
- **Reaction of White Phosphorus with Sodium Hydroxide**:
- When white phosphorus (P4) is heated with sodium hydroxide (NaOH), phosphine is produced.
- Reaction: \( P_4 + 4 NaOH + 2 H_2O \rightarrow 2 PH_3 + 2 Na_3PO_4 \)
- **Reaction of Calcium Phosphide with Water**:
- Calcium phosphide (Ca3P2) reacts with water to produce phosphine.
- Reaction: \( Ca_3P_2 + 6 H_2O \rightarrow 3 Ca(OH)_2 + 2 PH_3 \)
- **Reaction of Phosphorus Trioxide with Water**:
- Phosphorus trioxide (P2O3) reacts with water to yield phosphine.
- Reaction: \( P_2O_3 + 3 H_2O \rightarrow 2 PH_3 + 3 H_3PO_3 \)

3. **Reaction that Does Not Produce Phosphine**:
- **Heating Red Phosphorus with Sodium Hydroxide**:
- When red phosphorus is heated with sodium hydroxide, it does not produce phosphine. Instead, it forms a different compound, specifically H4P2O6 (phosphorous acid).
- Reaction: \( 2 P + 4 NaOH + 2 H_2O \rightarrow H_4P_2O_6 + 4 Na \)

4. **Conclusion**: Based on the analysis, the reaction that does not produce phosphine is the one involving red phosphorus and sodium hydroxide.

**Final Answer**: Phosphine is not obtained by the reaction of red phosphorus with sodium hydroxide.

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