Appearance of blood red colour, on treatment of the sodium fusion extract of an organic compound with FeSO 4 in presence of concentrated H 2 SO 4 indicates the presence of element/s

Chemistry · Practical Organic Chemistry

JEE Main 2024 — 29 January, Shift 1 — Question 64

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

Option A:
Br
Option B:
N
Option C:
N and S
Correct
Option D:
$S$

Answer: C

Step-by-step solution

$\mathrm{Fe}^{2+} \xrightarrow[\text { Conc. } \mathrm{H}_{2} \mathrm{SO}_{4}]{\mathrm{H}^{+}} \mathrm{Fe}^{+3}$ $\mathrm{Fe}^{+3} \xrightarrow{-\mathrm{SCN}} \mathrm{Fe}(\mathrm{SCN})_{3}$ (blood red colour)

Appearance of blood red colour indicates presence of both nitrogen and sulphur

Answer key and solution verified before publishing.

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Exam: JEE Main 2024
Paper: 29 January, Shift 1
Subject: Chemistry
Chapter: Practical Organic Chemistry
Topic: Qualitative organic analysis