In lassaigne test thio urea is converted into `:`

Options

A. `NaSCN`
B. `Na_(2)S`
C. `NaCN`
D. `Na_(2)SO_(4)`

Answer

To solve the question regarding the conversion of thiourea in the Lassaigne test, we will follow these steps:

### Step-by-Step Solution:

1. **Understanding Thiourea**:
- Thiourea is a compound with the formula \( \text{NH}_2\text{CS} \). It contains nitrogen (N), carbon (C), and sulfur (S).

2. **Lassaigne Test Overview**:
- The Lassaigne test is a qualitative analysis method used to detect the presence of certain elements (like nitrogen, sulfur, and halogens) in organic compounds. In this test, the organic compound is fused with sodium (Na).

3. **Reaction of Thiourea with Sodium**:
- When thiourea is fused with sodium, it undergoes a reaction where sodium reacts with the elements present in thiourea. The reaction can be summarized as:
\[ \text{Na} + \text{NH}_2\text{CS} \rightarrow \text{NaC} + \text{Na}_2\text{S} + \text{Na}_2\text{N} \]
- This means that sodium reacts with carbon, nitrogen, and sulfur from thiourea.

4. **Products of the Reaction**:
- The products formed in the Lassaigne test from thiourea are sodium cyanide (NaCN), sodium sulfide (Na2S), and sodium nitride (Na3N). However, in the context of the question, we focus on the main product that is formed.
- The key product here is sodium thiocyanate (NaSCN) which is derived from the sulfur and carbon present in thiourea.

5. **Conclusion**:
- In the Lassaigne test, thiourea is primarily converted into sodium thiocyanate (NaSCN).

### Final Answer:
In the Lassaigne test, thiourea is converted into sodium thiocyanate (NaSCN).

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