Sodium hydroxide solution reacts with phosphorus to give phosphine. To bring about this reaction, we need

Options

A. White phosphorus and dil. NaOH
B. White phosphorus and conc. NaOH
C. Red phosphorus and dil. NaOH
D. Red phosphorus and conc. NaOH

Explanation

To answer the question about the reaction between sodium hydroxide (NaOH) and phosphorus to produce phosphine (PH3), we can break down the process step by step.

### Step-by-Step Solution:

1. **Identify the Reactants**: The reactants in this reaction are sodium hydroxide (NaOH) and phosphorus (P). Specifically, the form of phosphorus that reacts with NaOH to produce phosphine is white phosphorus (P4).

2. **Understand the Reaction**: The reaction between sodium hydroxide and white phosphorus leads to the formation of phosphine (PH3). The balanced chemical equation for the reaction can be represented as:
\[ P_4 + 4 NaOH + 2 H_2O \rightarrow 2 Na_2HPO_4 + 2 PH_3 \]
This indicates that white phosphorus reacts with sodium hydroxide in the presence of water.

3. **Determine the Conditions for the Reaction**: For the formation of phosphine, it is essential to use dilute sodium hydroxide. Concentrated sodium hydroxide is not suitable for this reaction as it can lead to different products.

4. **Conclusion**: Therefore, to bring about the reaction between sodium hydroxide and phosphorus to produce phosphine, we need **dilute sodium hydroxide** and **white phosphorus**.

### Final Answer:
To bring about the reaction, we need **dilute sodium hydroxide** and **white phosphorus**.

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