Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A): In Lassaigne's test, an organic compound containing both nitrogen and sulphur gives a Prussian blue colour with Fe ³⁺ ions. Reason (R): During sodium fusion of such compounds, sodium thiocyanate is formed, which provides SCN ⁻ ions to form the blood-red [ Fe ( SCN )]²⁺ complex. In the light of the

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Assertion (A) is false because in Lassaigne's test, an organic compound containing both nitrogen and sulphur forms sodium thiocyanate ( NaSCN ) during fusion. This extract gives a blood-red colour with Fe ³⁺ ions, not a Prussian blue colour. Prussian blue is observed when only nitrogen is present. Reason (R) is true as the fusion of an organic compound containing both N and S with sodium yields NaSCN . The SCN ⁻ ions react with Fe ³⁺ to form the blood-red thiocyanatoiron(III) complex, [ Fe ( SCN )]²⁺ . Answer: Asse