In Lassaigne's extract of organic compound both nitrogen and sulphur are present, which gives blood-red colour with Fe 3 + due to the formation of

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Aicharya · Accepted Answer

When the organic sample containing nitrogen and sulphur is strongly heated with sodium metal the ionic compound sodium thiocyanate is formed. Sodium thiocyanate gives blood-red colour with neutral ${FeCl}_{3}$ .

$Na + N + C + S \overset{}{\to} NaSCN {SCN}^{-} + {Fe}^{3 +} \overset{}{\to} {[Fe (SCN)]}^{2 +}$

In Lassaigne's extract of organic compound both nitrogen and sulphur are present, which gives blood-red…

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