Which of the following compounds will NOT give a positive Lassaigne's test for nitrogen, despite con — Practical Organic Chemistry and Purification Chemistry Question

💡 Solution & Explanation

Lassaigne's test for nitrogen requires the formation of $NaCN$ during fusion. This requires the compound to contain both Carbon and Nitrogen. Hydrazine ($NH_2NH_2$) lacks carbon atoms, so it cannot form $NaCN$ and yields a negative result.