If an organic compound contains both nitrogen and sulphur, Lassaigne's test with a limited amount of — Practical Organic Chemistry and Purification Chemistry Question
Question
If an organic compound contains both nitrogen and sulphur, Lassaigne's test with a limited amount of sodium forms a species that gives a blood-red color with $FeCl_3$. The blood-red complex is:
Answer: C
💡 Solution & Explanation
Fusion produces sodium thiocyanate ($NaSCN$). The $SCN^-$ reacts with $Fe^{3+}$ to form iron(III) thiocyanate, $Fe(SCN)_3$ or $[Fe(SCN)]^{2+}$, which is blood-red.
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