The correct match between items of List-I and List-II is List - I List - II (A) Coloured impurity (P) Steam distillation (B) Mixture of o – nitrophenol and p –nitrophenol (Q) Fractional distillation (C) Crude Naphtha (R) Charcoal treatment (D) Mixture of glycerol and sugars (S) Distillation under reduced pressure

( A ) - ( R ) , ( B ) - ( P ) , ( C ) - ( Q ) , ( D ) - ( S )

( A ) - ( R ) , ( B ) - ( S ) , ( C ) - ( P ) , ( D ) - ( Q )

( A ) - ( P ) , ( B ) - ( S ) , ( C ) - ( R ) , ( D ) - ( Q )

( A ) - ( R ) , ( B ) - ( P ) , ( C ) - ( S ) , ( D ) - ( Q )

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A mixture of two organic compounds $A (b . p . 80 ° C)$ and $B (b . p . 110 ° C)$ can be separated by steam distillation.

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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>Methods of Purification of Organic Compounds

If Dichloromethane (DCM) and water

H_{2} O

are used for differential extraction, which one of the following statements is correct?

MEDIUM

Chemistry>Organic Chemistry>Organic Chemistry- Some Basic Principles and Techniques>Methods of Purification of Organic Compounds

The most suitable method of separation of

1 : 1

mixture of ortho and para-nitrophenol is:

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Chemistry>Organic Chemistry>Organic Chemistry- Some Basic Principles and Techniques>Methods of Purification of Organic Compounds

The organic compound which can be purified by steam distillation is :

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Chemistry>Organic Chemistry>Organic Chemistry- Some Basic Principles and Techniques>Methods of Purification of Organic Compounds

Which of the following statements is not true about partition chromatography?

MEDIUM

Chemistry>Organic Chemistry>Organic Chemistry- Some Basic Principles and Techniques>Methods of Purification of Organic Compounds

A flask contains a mixture of isohexane and

3

-methylpentane. One of the liquids boils at

63^{o} C

while the other boils at

60^{o} C .

What is the best way to separate the two liquids and which one will be distilled out first?

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Chemistry>Organic Chemistry>Organic Chemistry- Some Basic Principles and Techniques>Methods of Purification of Organic Compounds

A chromatography column, packed with silica gel as stationary phase, was used to separate a mixture of compounds consisting of

(A)

benzanilide

(B)

aniline and

(C)

acetophenone. When the column is eluted with a mixture of solvents, hexane:ethyl acetate

(20 : 80)

, the sequence of obtained compounds is:

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Chemistry>Organic Chemistry>Organic Chemistry- Some Basic Principles and Techniques>Methods of Purification of Organic Compounds

Aniline is insoluble in water and possesses a vapour pressure of

10.15 mmHg

373 K

. It can be conveniently purified by

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Chemistry>Organic Chemistry>Organic Chemistry- Some Basic Principles and Techniques>Methods of Purification of Organic Compounds

Which of the following mixtures can be separated by simple distillation?

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Chemistry>Organic Chemistry>Organic Chemistry- Some Basic Principles and Techniques>Methods of Purification of Organic Compounds

Paper chromatography is an example of

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Chemistry>Organic Chemistry>Organic Chemistry- Some Basic Principles and Techniques>Methods of Purification of Organic Compounds

Given below are two statements:

Statement $I$ : A mixture of chloroform and aniline can be separated by simple distillation.

Statement $II$ : When separating aniline from a mixture of aniline and water by steam distillation aniline boils below its boiling point.

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

MEDIUM

Chemistry>Organic Chemistry>Organic Chemistry- Some Basic Principles and Techniques>Methods of Purification of Organic Compounds

The elution sequence of a mixture of compounds containing chlorobenzene, anthracene and

p

-cresol developed from an alumina column using a solvent system of progressively increasing polarity is

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Chemistry>Organic Chemistry>Organic Chemistry- Some Basic Principles and Techniques>Methods of Purification of Organic Compounds

The principle of column chromatography is:

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Chemistry>Organic Chemistry>Organic Chemistry- Some Basic Principles and Techniques>Methods of Purification of Organic Compounds

Glycerol is separated in soap industries by :

HARD

Chemistry>Organic Chemistry>Organic Chemistry- Some Basic Principles and Techniques>Methods of Purification of Organic Compounds

A solution of

m -

chloroaniline,

m -

chlorophenol, and

m -

chlorobenzoic acid in ethyl acetate was extracted initially with a saturated solution of

N a H C O_{3}

to give fraction

A

. The leftover organic phase was extracted with a dilute

N a O H

solution to give a fraction

B

. The final organic layer was labelled as a fraction

C

. Fractions

A, B

and

C,

contain respectively:

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Chemistry>Organic Chemistry>Organic Chemistry- Some Basic Principles and Techniques>Methods of Purification of Organic Compounds

Which of the following processes for refining of metals involves a principle of selective adsorption of the components from a mixture.

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Chemistry>Organic Chemistry>Organic Chemistry- Some Basic Principles and Techniques>Methods of Purification of Organic Compounds

The correct match between items of List-I and List-II is

	List - I		List - II
(A)	Coloured impurity	(P)	Steam distillation
(B)	Mixture of o – nitrophenol and p –nitrophenol	(Q)	Fractional distillation
(C)	Crude Naphtha	(R)	Charcoal treatment
(D)	Mixture of glycerol and sugars	(S)	Distillation under reduced pressure

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Chemistry>Organic Chemistry>Organic Chemistry- Some Basic Principles and Techniques>Methods of Purification of Organic Compounds

Using the provided information in the following paper chromatogram:

Question Image

The calculated $R_{f}$ value of $A is_____\times 10^{- 1}$ .

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Chemistry>Organic Chemistry>Organic Chemistry- Some Basic Principles and Techniques>Methods of Purification of Organic Compounds

Given below are two statements:
Statement-I: Retardation factor $(R_{f})$ can be measured in meter/centimetre.

Statement-II: $R_{f}$ value of a compound remains constant in all solvents.

Choose the most appropriate answer from the options given below:

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Chemistry>Organic Chemistry>Organic Chemistry- Some Basic Principles and Techniques>Methods of Purification of Organic Compounds

In chromatography, which of the following statements is incorrect for

R_{f}

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Chemistry>Organic Chemistry>Organic Chemistry- Some Basic Principles and Techniques>Methods of Purification of Organic Compounds

The distillation technique most suited for separating glycerol from spent - lye in the soap industry is:

A mixture of two organic compounds A (b.p. 80 °C) and B (b.p. 110 °C) can be separated by steam distillation.

Important Questions on Organic Chemistry- Some Basic Principles and Techniques

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A mixture of two organic compounds $A (b . p . 80 ° C)$ and $B (b . p . 110 ° C)$ can be separated by steam distillation.