Practice question
Question
In Lassaigne’s test, an organic compound produces a blood-red color with FeCl₃ but no violet color with sodium nitroprusside. What elements are present?
Explanation
Blood-red color with FeCl₃ indicates nitrogen and sulphur together (NaSCN), while no violet color with sodium nitroprusside suggests sulphur alone isn’t detected, but the former confirms both.
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