MCQ
Which compound does not give positive test in Lassaigne's test for nitrogen?
- AUrea
- BHydrazine
- CAzobenzene
- DPhenyl hydrazine
✓
Answer
- Hydrazine
Explanation:
In Lassaigne's test, the organic compound is fused with sodium.
Carbon and nitrogen present in the organic compound gives sodium cyanide (NaCN).
This is further used in the test for nitrogen.
Hydrazine (H2N − NH2) do not contain carbon. It cannot form NaCN on fusion with sodium.
Hence, hydrazine cannot give Lassaigne's test for nitrogen.
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