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

A → III ; B → I ; C → IV ; D → II

A → II ; B → IV ; C → I ; D → III

A → IV ; B → II ; C → I ; D → III

A → II ; B → I ; C → IV ; D → III

The correct match between item I and item II is Item I (Compound) Item II (Reagent) a . Lysine p . 1 - naphthol b . Furfural q . Ninhydrin c . Benzyl alcohol r . KMnO 4 d . Styrene s . Ceric ammonium nitrate

a → q , b → p , c → s , d → r

a → q , b → r , c → s , d → p

a → r , b → p , c → q , d → s

a → q , b → p , c → r , d → s

HARD

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Important Questions on Organic Chemistry - Some Basic Principles and Techniques

EASY

Chemistry>Organic Chemistry>Organic Chemistry - Some Basic Principles and Techniques>Qualitative Elemental Analysis of Organic Compounds

The formula of the purple colour formed in Lassaigne's test for sulphur using sodium nitroprusside is

HARD

Chemistry>Organic Chemistry>Organic Chemistry - Some Basic Principles and Techniques>Qualitative Elemental Analysis of Organic Compounds

Match the organic compounds in column -

I

with the Lassaigne's test result in column -

II

appropriately:

	Column – $I$		Column - $II$
A.	Aniline	i.	Red colour with $F e C l_{3}$
B.	Benzene sulfonic acid	ii.	Violet color with sodium nitroprusside
C.	Thiourea	iii.	Blue color with and acidic solution of $F e S O_{4}$

MEDIUM

Chemistry>Organic Chemistry>Organic Chemistry - Some Basic Principles and Techniques>Qualitative Elemental Analysis of Organic Compounds

Given below are two statements :

Statement I : In 'Lassaigne's Test', when both nitrogen and sulphur are present in an organic compound, sodium thiocyanate is formed.

Statement II : If both nitrogen and sulphur are present in an organic compound, then the excess of sodium used in sodium fusion will decompose the sodium thiocyanate formed to give $NaCN$ and ${Na}_{2} S$ .

In the light of the above statements, choose the most appropriate answer from the options given below

EASY

Chemistry>Organic Chemistry>Organic Chemistry - Some Basic Principles and Techniques>Qualitative Elemental Analysis of Organic Compounds

A solution of ${FeCl}_{3}$ when treated with $K_{4} [Fe (CN)_{6}]$ gives a prussian blue precipitate due to the formation of

EASY

Chemistry>Organic Chemistry>Organic Chemistry - Some Basic Principles and Techniques>Qualitative Elemental Analysis of Organic Compounds

In Lassaigne's test, on boiling sodium thiocyanate with ferrous sulphate produces

MEDIUM

Chemistry>Organic Chemistry>Organic Chemistry - Some Basic Principles and Techniques>Qualitative Elemental Analysis of Organic Compounds

Given below are two statements:

Statement I: Sulphanilic acid gives esterification test for carboxyl group.

Statement II: Sulphanilic acid gives red colour in Lassigne’s test for extra element detection.

In the light of the above statements, choose the most appropriate answer from the options given below:

EASY

Chemistry>Organic Chemistry>Organic Chemistry - Some Basic Principles and Techniques>Qualitative Elemental Analysis of Organic Compounds

The blood red color of sulfur containing organic compound of Lassaigne's extract is due to the formation of ________

EASY

Chemistry>Organic Chemistry>Organic Chemistry - Some Basic Principles and Techniques>Qualitative Elemental Analysis of Organic Compounds

The reddish brown precipitate formed in the Fehling's test for aldehydes (RCHO) is due to the formation of

EASY

Chemistry>Organic Chemistry>Organic Chemistry - Some Basic Principles and Techniques>Qualitative Elemental Analysis of Organic Compounds

The potassium ferrocyanide solution gives a Prussian blue colour, when added to :

EASY

Chemistry>Organic Chemistry>Organic Chemistry - Some Basic Principles and Techniques>Qualitative Elemental Analysis of Organic Compounds

An iodo-organic compound, when fused with sodium metal, followed by acidification with nitric acid and then treated with silver nitrate gives

MEDIUM

Chemistry>Organic Chemistry>Organic Chemistry - Some Basic Principles and Techniques>Qualitative Elemental Analysis of Organic Compounds

Match List-I with List-II.

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

Choose the correct answer from the options given below:

MEDIUM

Chemistry>Organic Chemistry>Organic Chemistry - Some Basic Principles and Techniques>Qualitative Elemental Analysis of Organic Compounds

In the detection of nitrogen of an organic compound by Lassaigne's test, a prussian blue colour is obtained. This is due to the formation of which of the following complexes?

EASY

Chemistry>Organic Chemistry>Organic Chemistry - Some Basic Principles and Techniques>Qualitative Elemental Analysis of Organic Compounds

The correct match between item

I

and item

II

Item $I$ (Compound)		Item $II$ (Reagent)
$a .$	Lysine	$p .$	$1 -$ naphthol
$b .$	Furfural	$q .$	Ninhydrin
$c .$	Benzyl alcohol	$r .$	${KMnO}_{4}$
$d .$	Styrene	$s .$	Ceric ammonium nitrate