Question

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?

• A.
• B.
• C.
• D.

Answer 1

The correct option is B

Compounds where nitrogen is present as diazo group do not give Lassaigne's test.