JEE MAIN - Chemistry (2024 - 29th January Morning Shift - No. 18)
Appearance of blood red colour, on treatment of the sodium fusion extract of an organic compound with $$\mathrm{FeSO}_4$$ in presence of concentrated $$\mathrm{H}_2 \mathrm{SO}_4$$ indicates the presence of element/s
Br
S
N and S
N
Explanation
$$\begin{aligned} & \mathrm{Fe}^{2+} \xrightarrow[\text { Conc. } \mathrm{H}_2 \mathrm{SO}_4]{\mathrm{H}^{+}} \mathrm{Fe}^{+3} \\ & \mathrm{Fe}^{+3} \xrightarrow{- \text { SCN }} \mathrm{Fe}(\mathrm{SCN})_3 \text { (blood red colour) } \end{aligned}$$
Appearance of blood red colour indicates presence of both nitrogen and sulphur.
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