Question 36

Which of the following nitrogen containing compound does not give Lassaigne's test?

Solution

Lassaigne's test involves fusing the organic compound with sodium metal to convert covalent organic compounds into ionic compounds (NaCN for N-containing compounds).

Hydrazine (N₂H₄) does not contain carbon. In Lassaigne's test, N is detected through the formation of NaCN, which requires both N and C. Since hydrazine has no carbon, it cannot form NaCN and hence does not give a positive Lassaigne's test for nitrogen.

The correct answer is Option 4: Hydrazine.

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