Which compound does not give positive test in Lassaigne's test for nitrogen?

Urea

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Hydrazine

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Azobenzene

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Phenyl hydrazine

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Solution

The correct option is B Hydrazine
In Lassaigne's test, the organic compound is fused with sodium.
Carbon and nitrogen present in the organic compound gives sodium cyanide ( $N a C N$ ).
This is further used in the test for nitrogen.
Hydrazine $(H_{2} N - N H_{2})$ do not contain carbon. It cannot form $N a C N$ on fusion with sodium.
Hence, hydrazine cannot give Lassaigne's test for nitrogen.

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