Match List I with List II. List-I (Anion) List-II (gas evolved on reaction with dil. H 2 SO 4 ) (A) CO 3 2 - (I) Colourless gas which turns lead acetate paper black. (B) S 2 - (II) Colourless gas which turns acidified potassium dichromate solution green. (C) SO 3 2 - (III) Brown fumes which turns acidified KI solution containing starch blue. (D) NO 2 - (IV) Colourless gas evolved with brisk effervescence, which turns lime water milky. Choose the correct answer from the options given below

A - IV , B - I , C - II , D - III

A - III , B - I , C - II , D - IV

A - II , B - I , C - IV , D - III

A - IV , B - I , C - III , D - II

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

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Sodium carbonate extract is prepared by:

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Important Questions on Organic Chemistry - Some Basic Principles and Techniques

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

A white precipitate was formed when

{BaCl}_{2}

was added to water extract of an inorganic salt. Further, a gas

' X'

with characteristic odour was released when the formed white precipitate was dissolved in dilute HCI. The anion present in the inorganic salt is:

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

In the detection of II group acid radical, the salt containing chloride is treated with concentrated sulphuric acid, the colourless gas is liberated. The name of the gas is

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

Match List I with List II.

	List-I (Anion)		List-II (gas evolved on reaction with dil. $H_{2} {SO}_{4}$ )
(A)	${CO}_{3}^{2 -}$	(I)	Colourless gas which turns lead acetate paper black.
(B)	$S^{2 -}$	(II)	Colourless gas which turns acidified potassium dichromate solution green.
(C)	${SO}_{3}^{2 -}$	(III)	Brown fumes which turns acidified KI solution containing starch blue.
(D)	${NO}_{2}^{-}$	(IV)	Colourless gas evolved with brisk effervescence, which turns lime water milky.

Choose the correct answer from the options given below

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 $F e S O_{4}$

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

On heating, lead (ll) nitrate gives a brown gas (A). The gas (A) on cooling changes to a colourless solid/liquid (B). (B) on heating with NO changes to ablue solid (C). The oxidation number of nitrogen in solid (C) is:

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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

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

Which combines with

{Fe}^{2 +}

to form brown complex?

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

Sodium extract is heated with concentrated

H N O_{3}

before testing for halogens because :

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

Reaction of an inorganic sulphite

X

with dilute

H_{2} {SO}_{4}

generated compound

Y

. Reaction of

Y

with

NaOH

gives

X

. Further, the reaction of

X

with

Y

and water affords compound

Z, Y

and

X

, respectively, are :

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

Sodium nitroprusside, when added to an alkaline solution of sulphide ions, produce a

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

Acetic acid reacts with sodium metal at room temperature to produce

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

When treated with conc.

HCl, {MnO}_{2}

yields gas

(X)

which further reacts with

Ca {(OH)}_{2}

to generate a white solid

(Y)

reacts with dil.

HCl

to produce the same gas

X .

the solid

Y

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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

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

A white sodium salt dissolves readily in water to give a solution which is neutral to litmus. When silver nitrate solution is added to the before mentioned solution, a white precipitate is obtained which does not dissolve in dilute nitric acid. The anion is:

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

In the following reaction

Question Image

The major product is

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

When nitrogen and chlorine containing organic compound is reacted with sodium metal, it forms

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

Which of the following compound will give blood red colour while doing the Lassaigne's test for

N

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

When a mixture of

NaCl, K_{2} {Cr}_{2} O_{7}

and concentrated

H_{2} {SO}_{4}

is heated in a dry test tube, a red vapour

(X)

is evolved. This vapour

(X)

turns an aqueous solution of

NaOH

yellow due to the formation of

Y . X

and

Y,

respectively, are:

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

{HgCl}_{2}

and

I_{2}

both when dissolved in water containing

I^{-}

ions the pair of species formed is:

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

The sodium salt of an organic acid

X

produces effervescence with concentrated

H_{2} {SO}_{4}

X

reacts with the acidified aqueous

{CaCl}_{2}

solution to give a white precipitate which decolourises acidic solution of

{KMnO}_{4}

X

Sodium carbonate extract is prepared by:

Important Questions on Organic Chemistry - Some Basic Principles and Techniques

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