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 ofNEET 2023 (All India)

Question

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

Chemistry - PRACTICAL ORGANIC CHEMISTRY Question with Solution | TestHub

Options:

Doubts & Discussion