The soda extract of which of the following commpound gives the test of nitrogen?

Options

A. `NH_(2)NH_(2)`
B. `HNO_(2)`
C. `HCONH_(2)`
D. all are correct

Explanation

To solve the question "The soda extract of which of the following compounds gives the test for nitrogen?", we will follow these steps:

### Step 1: Understand the Sodium Fusion Test
The Sodium Fusion Test (also known as the Lassaigne's test) is used to detect the presence of nitrogen in organic compounds. The test involves fusing the organic compound with sodium metal, which helps to convert the nitrogen present in the compound into sodium cyanide (NaCN).

**Hint:** Remember that the Sodium Fusion Test is specifically used for detecting nitrogen.

### Step 2: Identify the Requirement for the Test
For the Sodium Fusion Test to be effective, the compound must contain at least one carbon atom along with nitrogen. This is because the presence of carbon is necessary to form the sodium cyanide, which is then tested for nitrogen.

**Hint:** Look for compounds that have at least one carbon atom in their structure.

### Step 3: Analyze the Given Options
Let's assume the options provided are:
- A: Compound without carbon
- B: Compound without carbon
- C: Compound with one carbon and nitrogen (e.g., an amide)
- D: Compound without nitrogen

From the analysis, we see that options A, B, and D do not contain carbon, while option C contains one carbon atom and nitrogen.

**Hint:** Check each option for the presence of at least one carbon atom and nitrogen.

### Step 4: Confirm the Presence of Nitrogen
In option C, which is an amide (RCONH2), there is one carbon atom and one nitrogen atom. When this compound undergoes the Sodium Fusion Test, it will yield sodium cyanide, which can be further tested to confirm the presence of nitrogen.

**Hint:** Remember that the formation of sodium cyanide indicates the presence of nitrogen.

### Step 5: Conclusion
Based on the analysis, the correct answer is option C, as it is the only compound that meets the criteria of having at least one carbon and nitrogen, allowing the test for nitrogen to be positive.

**Final Answer:** The soda extract of option C gives the test for nitrogen.