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 . The blood-red complex is:

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:

Prashant Kotian · Accepted Answer

Correct answer: C. Fusion produces sodium thiocyanate (). The reacts with to form iron(III) thiocyanate, or , which is blood-red.

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