Appearance of blood red colour, on treatment of the sodium fusion extract of an organic compound with \(\mathrm{FeSO}_{4…
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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
[JEE Main 2024, 29 Jan (Shift 1)]
✓ Correct answer: b)
\(\mathrm{N}\) and \(\mathrm{S}\)
Explanation
\({\text{Fe}}^{2+}\overset{{\text{H}}^{+}}{\underset{\text{conc. }{\text{H}}_{2}{\text{SO}}_{4}}{\to }}{\text{Fe}}^{3+}\)
\({\text{Fe}}^{3+}+{\text{SCN}}^{−}\to {\text{Fe(SCN)}}_{3}\text{ }(\text{blood-red colour})\)
Appearance of blood-red colour confirms the presence of both nitrogen and sulphur.
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