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Byju's Answer
Standard XII
Chemistry
Introduction to Aromatic Compounds
The fusion of...
Question

The fusion of an organic compound with solid sodium metal is undertaken for testing nitrogen, sulphur and halogens. This test is called:

A
Dumas method
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B
Carius method
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C
Kjeldahl's method
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D
Lassaigne's test
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Solution

The correct option is D Lassaigne's test
It is a general test for the detection of halogens, nitrogen and sulphur in an organic compound. These elements are covalently bonded to the organic compounds. Lassaigne’s test can be carried out only in ionic form. Thus, the elements in a compound are converted from covalent to ionic form by fusing an organic compound with Sodium (Na) metal. The ionic compounds formed during the fusion are extracted in aqueous solution and can be used for detection of halogens, nitrogen and sulphur by simple chemical tests. This called Lassaigne's test.

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Q. Explain the reason for the fusion of an organic compound with metallic sodium for testing nitrogen. sulphur, and halogens.
Q. The sodium test, or Lassaigne’s test, is used in an elemental analysis of the qualitative determination of the presence of foreign elements, namely halogens, nitrogen, sulphur and phosphorus in an organic compound.
The test involves heating the sample strongly with a clean sodium metal, ‘fusing’ it with the sample. The ‘fused’ sample is then plunged into water, and the usual qualitative tests are performed on the resultant solution for the respective possible constituents.
Which of the following compounds will give negative Lassaigne’s test for nitrogen?
Q. In the sodium fusion test of organic compounds, the nitrogen of an organic compound is converted to:
Q. The sodium test, or Lassaigne’s test, is used in an elemental analysis of the qualitative determination of the presence of foreign elements, namely halogens, nitrogen, sulphur and phosphorus in an organic compound.
The test involves heating the sample strongly with a clean sodium metal, ‘fusing’ it with the sample. The ‘fused’ sample is then plunged into water, and the usual qualitative tests are performed on the resultant solution for the respective possible constituents.

When both N and S are present in an organic compound, the sodium extract with FeCl3 gives a:
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Introduction to Aromatic Compounds
Standard XII Chemistry
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