(A) When both nitrogen and sulphur are present in an organic compound,sodium thiocyanate $(NaSCN)$ is formed during the preparation of Lassaigne's ext

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(A) When both nitrogen and sulphur are present in an organic compound,sodium thiocyanate $(NaSCN)$ is formed during the preparation of Lassaigne's extract.$Na + C + N + S \rightarrow NaSCN$This $NaSCN$ reacts with $Fe^{3+}$ ions to form a blood-red coloured complex,$[Fe(SCN)]^{2+}$.$Fe^{3+} + SCN^{-} \rightarrow [Fe(SCN)]^{2+}$Since all nitrogen is consumed in the formation of $SCN^-$,no free cyanide ions $(CN^-)$ are available to form the prussian blue precipitate.

Class 11 Chemistry 8-3.Organic Chemistry : Purification and characterization Chemical analysis of organic compounds

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In Lassaigne's extract of an 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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A
$[Fe(SCN)]^{2+}$
B
$Fe_4[Fe(CN)_6]_3 \cdot xH_2O$
C
$NaSCN$
D
$[Fe(CN)_5NOS]^{4-}$

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8-3.Organic Chemistry : Purification and characterization

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Chemical analysis of organic compounds

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Which of the following compounds will not give a positive Lassaigne's test for nitrogen?

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Which one of the following reactions does $NOT$ belong to "Lassaigne's test"?

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Match List-$I$ with List-$II$.
List-$I$ (Functional group detection) List-$II$ (Change observed during detection)
$A$. Unsaturation (Baeyer's test) $I$. Red colour appears
$B$. Alcoholic group (Ceric ammonium nitrate test) $II$. Silver mirror appears
$C$. Aldehyde group (Tollen's reagent) $III$. Violet colour appears
$D$. Phenolic group ($FeCl_3$ test) $IV$. Discharge of pink colour

Choose the correct answer from the options given below:

List-$I$ (Functional group detection)	List-$II$ (Change observed during detection)
$A$. Unsaturation (Baeyer's test)	$I$. Red colour appears
$B$. Alcoholic group (Ceric ammonium nitrate test)	$II$. Silver mirror appears
$C$. Aldehyde group (Tollen's reagent)	$III$. Violet colour appears
$D$. Phenolic group ($FeCl_3$ test)	$IV$. Discharge of pink colour

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In the preparation of sodium fusion extract,the purpose of fusing organic compound with a piece of sodium metal is to

MediumKCET 2025

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In organic compounds,nitrogen is tested in Lassaigne's test as:

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In Lassaigne's extract of an 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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Which of the following compounds will not give a positive Lassaigne's test for nitrogen?

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