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If an organic compound contains both Nitrogen and Sulphur simultaneously, Lassaigne's fusion with a Qualitative and Quantitative Analysis Chemistry Question

Question

If an organic compound contains both Nitrogen and Sulphur simultaneously, Lassaigne's fusion with a distinctly limited amount of sodium metal yields sodium thiocyanate ($NaSCN$). This specific salt gives a blood-red coloration upon the addition of:

Answer: B

💡 Solution & Explanation

The $SCN^-$ ion reacts with $Fe^{3+}$ ions (provided by $FeCl_3$) to form the ferrithiocyanate complex, $[Fe(SCN)]^{2+}$, which exhibits a highly characteristic and intense blood-red color.

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