Quantitive measurements of nitrogen in an organic compounds is done by the method.

Options

A. Barthelot method
B. Belstein method
C. Lassaigne test
D. Kjheldayhl's method

Answer

To solve the question regarding the quantitative measurement of nitrogen in organic compounds, we will analyze the provided options step by step.

### Step-by-Step Solution:

1. **Understanding the Question**:
The question asks for the method used for the quantitative measurement of nitrogen in organic compounds.

2. **Analyzing the Options**:
- **Option A: Bartelon Method**:
- This method is primarily used for determining urea and ammonia.
- The reagent used is an alkaline solution of phenol and hypochlorite.
- Since it is not specifically for the quantitative measurement of nitrogen in general organic compounds, this option is not suitable.

- **Option B: Belstein Test**:
- This is a qualitative test for organic halides.
- It involves a flame test that produces a blue-green flame indicating the presence of organic halides.
- As this test does not measure nitrogen quantitatively, this option is also not suitable.

- **Option C: Laziness Test**:
- This test is used for the qualitative detection of nitrogen, sulfur, and halogens in organic compounds.
- It does not provide quantitative measurements of nitrogen, making this option unsuitable as well.

- **Option D: Gelder's Method**:
- This method is specifically designed for the quantitative estimation of nitrogen in organic substances.
- In this method, the nitrogen from the organic compound is converted to ammonia for estimation.
- Therefore, this method is appropriate for the quantitative measurement of nitrogen.

3. **Conclusion**:
Based on the analysis of all options, the correct answer is **Option D: Gelder's Method**, as it is the only method listed that is used for the quantitative measurement of nitrogen in organic compounds.

### Final Answer:
The quantitative measurement of nitrogen in organic compounds is done by **Gelder's Method**.

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