Which of the organic compounds will give red colour in Lassaigne...

If both nitrogen and sulphur are present in a organic compound, they will give red blood colour with Lassaigne test due to the formation of ferric thiocyanate. $$\begin{aligned} & \mathrm{Na}+\mathrm{C}+\mathrm{S}+\mathrm{N} \xrightarrow{\Delta} \quad \mathrm{NaSCN} \\ & \text{ sodium. thiocyanate } \\ & \mathrm{Fe}^{3+}+3 \mathrm{NaSCN} \longrightarrow \mathrm{Fe}(\mathrm{SCN})_3+3 \mathrm{Na}^{+} \\ & \text{ferric thiocyanate } \\ & \text{ (blood red colouration) } \\ & \end{aligned}$$