Which of the following specific nitrogen-containing compounds will fundamentally FAIL to give a posi — Qualitative and Quantitative Analysis Chemistry Question

💡 Solution & Explanation

Lassaigne's test detects nitrogen by fusing the compound with sodium to form $NaCN$. For $NaCN$ to form, the original organic molecule MUST contain both Carbon and Nitrogen. Hydrazine ($NH_2NH_2$) lacks carbon entirely, rendering the formation of the cyanide ion impossible.