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Lassaigne’s test for the detection of nitrogen fails in

1. (a) NH₂CONH₂.HCl
2. (b) NH₂NH₂.HCl
3. (c) NH₂CONH₂
4. (d) C₆H₅NHNH₂.HCl

Correct answer: (b) NH₂NH₂.HCl

Solution

Lassaigne's test for nitrogen fails in compounds like NH₂NH₂.HCl because the nitrogen is not covalently bonded to carbon, which is essential for the test to work.

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