In Lassaigne’s extract of an organic compound, both nitrogen... | Chemistry | SolveeIt | Solveeit

Today, August 19

Question

In Lassaigne’s extract of an organic compound, both nitrogen and sulphur are present, which gives blood red colour with Fe3+ due to the formation of

A

NaSCN

B

[Fe(CN)5 NOS]4-

C

[Fe(SCN)]2+

D

Fe4[Fe(CN6)]3.xH2O

Answer

[Fe(SCN)]2+

Explanation

Solution

When both nitrogen and sulfur are present in an organic compound, sodium thiocyanate is produced. This combination does not produce prussian blue because there are no free cyanide lons. Instead, it produces a blood-red color.
Na + C + N + S $\to$ NaSCN
Fe+3 + SCN $\to$ [Fe(SCN)]2+(Red blood)
Therefore, The correct option is (C): [Fe(SCN)]2+(Red Blood)