Match List-I with List-II. List-I Element detected List-II Reagent used/Product formed $A$ Nitrogen $I$ ${\mathrm{Na}}_{2}[\mathrm{Fe}{(\mathrm{CN})}_{5}\mathrm{NO}]$ $B$ Sulphur $\mathrm{II}$ ${\mathrm{AgNO}}_{3}$ $C$ Phosphorus $\mathrm{III}$ ${\mathrm{Fe}}_{4}{[\mathrm{Fe}{(\mathrm{CN})}_{6}]}_{3}$ $D$ Halogen $\mathrm{IV}$ ${({\mathrm{NH}}_{4})}_{2}{\mathrm{MoO}}_{4}$ Choose the correct answer from the options given below:

JEE Main 2023 — Chemistry Organic Chemistry

2023mcqhard

Match List-I with List-II.

List-I Element detected		List-II Reagent used/Product formed
$A$	Nitrogen	$I$	${\mathrm{Na}}_{2}[\mathrm{Fe}{(\mathrm{CN})}_{5}\mathrm{NO}]$
$B$	Sulphur	$\mathrm{II}$	${\mathrm{AgNO}}_{3}$
$C$	Phosphorus	$\mathrm{III}$	${\mathrm{Fe}}_{4}{[\mathrm{Fe}{(\mathrm{CN})}_{6}]}_{3}$
$D$	Halogen	$\mathrm{IV}$	${({\mathrm{NH}}_{4})}_{2}{\mathrm{MoO}}_{4}$

Choose the correct answer from the options given below:

Official previous-year question

Held on 6 Apr 2023 · Verified 6 Jul 2026.

Options

A
$A\rightarrow \mathrm{III};B\rightarrow I;C\rightarrow \mathrm{IV};D\rightarrow \mathrm{II}$
B
$A\rightarrow \mathrm{II};B\rightarrow \mathrm{IV};C\rightarrow I;D\rightarrow \mathrm{III}$
C
$A\rightarrow \mathrm{IV};B\rightarrow \mathrm{II};C\rightarrow I;D\rightarrow \mathrm{III}$
D
$A\rightarrow \mathrm{II};B\rightarrow I;C\rightarrow \mathrm{IV};D\rightarrow \mathrm{III}$

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Solution

The nitrogen present in the organic compound on fusion with sodium metal gives sodium cyanide ( $\mathrm{NaCN}$ ) soluble in water. This is converted into sodium ferrocyanide by the addition of sufficient quantity of ferrous sulphate.

$6\mathrm{NaCN}+{\mathrm{FeSO}}_{4}\rightarrow \underset{\text{Sodium ferrocyanide}}{{\mathrm{Na}}_{4}[\mathrm{Fe}(\mathrm{CN}{)}_{6}]}+{\mathrm{Na}}_{2}{\mathrm{SO}}_{4}$ Ferric ions generated during the process react with ferrocyanide to form Prussian blue precipitate of ferric ferrocyanide.

${\mathrm{Na}}_{4}[\mathrm{Fe}(\mathrm{CN}{)}_{6}]+{\mathrm{Fe}}^{3+}\rightarrow \underset{\text{prussian blue}}{\underset{\text{Ferric ferrocyanide}}{{\mathrm{Fe}}_{4}[\mathrm{Fe}(\mathrm{CN}{)}_{6}{]}_{3}}}$

Sulphur present in organic compounds are detected by Lassaigne’s test. Here, a small piece of $\mathrm{Na}$ metal is heated in a fusion tube with the organic compound. The principle is that, in doing so, $\mathrm{Na}$ converts all the elements present into ionic form.

$2\mathrm{Na}+S\rightarrow {\mathrm{Na}}_{2}S$

Test of sulphur :

The extract is treated with sodium nitroprusside. The appearance of violet colour indicates the presence of sulphur.The following reaction occurs:

${S}^{2-}+[\mathrm{Fe}(\mathrm{CN}{)}_{5}\mathrm{NO}{]}^{2-}\rightarrow [\mathrm{Fe}(\mathrm{CN}{)}_{5}\mathrm{NOS}{]}^{4-}$

The phosphorus present in the compound is oxidised to phosphate. The solution is boiled with nitric acid and then treated with ammonium molybdate. A yellow colouration or precipitate indicates the presence of phosphorus.

The halogen present in the compound converted into sodium halide, and it will be precipitated with silver nitrate.

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Options

$A\rightarrow \mathrm{III};B\rightarrow I;C\rightarrow \mathrm{IV};D\rightarrow \mathrm{II}$

$A\rightarrow \mathrm{II};B\rightarrow \mathrm{IV};C\rightarrow I;D\rightarrow \mathrm{III}$

$A\rightarrow \mathrm{IV};B\rightarrow \mathrm{II};C\rightarrow I;D\rightarrow \mathrm{III}$

$A\rightarrow \mathrm{II};B\rightarrow I;C\rightarrow \mathrm{IV};D\rightarrow \mathrm{III}$

Solution

$2\mathrm{Na}+S\rightarrow {\mathrm{Na}}_{2}S$

Test of sulphur :

The extract is treated with sodium nitroprusside. The appearance of violet colour indicates the presence of sulphur.The following reaction occurs:

${S}^{2-}+[\mathrm{Fe}(\mathrm{CN}{)}_{5}\mathrm{NO}{]}^{2-}\rightarrow [\mathrm{Fe}(\mathrm{CN}{)}_{5}\mathrm{NOS}{]}^{4-}$

The halogen present in the compound converted into sodium halide, and it will be precipitated with silver nitrate.

JEE Main 2023 — Chemistry Organic Chemistry

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Solution

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JEE Main 2023 — Chemistry Organic Chemistry

Options

Did you get this right?

Solution

Your note

JEE Main Organic Chemistry in other years

More JEE Main Organic Chemistry questions

Other Chemistry topics for JEE Main

Physical Chemistry

Inorganic Chemistry

Keep practicing Organic Chemistry