Which of the following specific nitrogen-containing compounds will fundamentally FAIL to give a positive Prussian blue coloration in Lassaigne's test for nitrogen because it lacks a required elemental

Question

Which of the following specific nitrogen-containing compounds will fundamentally FAIL to give a positive Prussian blue coloration in Lassaigne's test for nitrogen because it lacks a required elemental component for the sodium fusion step?

Prashant Kotian · Accepted Answer

Correct answer: C. Lassaigne's test detects nitrogen by fusing the compound with sodium to form . For to form, the original organic molecule MUST contain both Carbon and Nitrogen. Hydrazine () lacks carbon entirely, rendering the formation of the cyanide ion impossible.

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