In Lassaigne's test which of the followingorganic compound...

In Lassaigne's test which of the followingorganic compound will produce a blood red colour when its sodium extract is treated with $\mathrm{FeCl}_3$ solution?
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Key Concepts

Lassaigne's Test

A qualitative analytical method used in organic chemistry to detect the presence of elements such as halogens, nitrogen, and sulfur in an organic compound. The test is based on the principle that when an organic compound is fused with metallic sodium, its covalently bonded elements are converted into water?soluble inorganic salts, which can then be detected by specific chemical tests.

Sodium Fusion (Sodium Extract) Technique

A procedure in which an organic compound is heated with metallic sodium to break robust carbon–element bonds. This process converts nonmetal elements such as nitrogen, halogens, and sulfur into their corresponding sodium salts, making it possible to test for their presence by simple chemical reactions.

Detection of Nitrogen via Cyanide Formation

In Lassaigne's test, if the organic compound contains nitrogen, the sodium fusion converts it into sodium cyanide. This inorganic cyanide then reacts in subsequent tests, serving as an indicator for the presence of the nitrogen atom in the original organic molecule.

Ferric Chloride (FeCl3) Test

A chemical test wherein the sodium extract is treated with FeCl3 solution. In the context of detecting nitrogen (especially when it is converted to sodium cyanide), the reaction produces a characteristic blood red coloration. This distinct color change serves as a confirmatory sign of the presence of nitrogen in the form of a cyanide ion.

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