Which of the following specific nitrogen-containing organic compounds fails to give a positive Lassaigne's test for nitrogen because it lacks a fundamental elemental prerequisite for the formation of

Question

Which of the following specific nitrogen-containing organic compounds fails to give a positive Lassaigne's test for nitrogen because it lacks a fundamental elemental prerequisite for the formation of the sodium fusion extract intermediate?

Prashant Kotian · Accepted Answer

Correct answer: C. The Lassaigne's test for nitrogen detects the presence of the cyanide ion () in the sodium fusion extract. To form , the organic compound must contain both Nitrogen and Carbon. Hydrazine () lacks carbon entirely. Thus, it cannot form upon fusion with sodium, and subsequently fails to produce the Prussian blue color.

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