Sodium fusion extract of an organic compound gives a blood red colour on adding $\mathrm{FeCl}_{3}$

Question

Sodium fusion extract of an organic compound gives a blood red colour on adding $\mathrm{FeCl}_{3}$ solution, in Lassaigne's test. The substance contains\

Professor PC Thomas Classes · Answer

$\mathrm{Na}+\mathrm{C}+\mathrm{N}+\mathrm{S} ightarrow \mathrm{NaCNS}$ $$ 3 \mathrm{NaCNS}+\mathrm{FeCl}_{3} ightarrow $$ $\mathrm{Fe}(\mathrm{CNS})_{3}$ (blood red) +3 NaCl\