Practical Organic Chemistry Test

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Practical Organic Chemistry Test - 1

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Weekly Quiz Competition

Question 1
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Which of the following is not true about Hinsberg test? It is applicable to

A
Solid amines insoluble in water

B
Liquid amines soluble in water

C
All amines

D
Liquid amines insoluble in water

Solution

Hinsberg test is applicable to liquid amines which are insoluble in water because water solubility of the amine decreases nucleophilicity of nitrogen.
Question 2
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Simple distillation can’t be used to separate

A
Essential oils

B
A mixture of benzene (b.p. 353 K) and thiophene (b.p. 357 K)

C
A mixture of ethyl alcohol (b.p. 351 K) and water (b.p. 373 K)

D
A mixture of ether (b.p. 308 K) and toluene (b.p. 383 K)

Solution

Simple distillation is applied when boiling points of the two components differ by more than 10°C. Ethanol and water both are capable of forming intermolecular H-bonds with each other, so they distil together. The constituents of essential oils have nearly similar boiling point.
Question 3
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What is the function of steam in steam distillation of aniline?

A
To decrease the vapour pressure of the liquid to be distilled

B
To dissolve the liquid due to high temperature

C
To increase the vapour pressure of the liquid to be distilled

D
To carry vapour of the liquid with it, it has nothing to do with the vapour pressure of the liquid

Solution

In steam distillation of aniline, steam decreases vapour pressure of the liquid which in turn starts boiling below its usual boiling point. Hence steam distillation is considered analogous to distillation under reduced pressure.
Question 4
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During steam distillation of a mixture of o-nitrophenol and p-nitrophenol

A
Vapour of o-nitrophenol are carried by steam because of its lower boiling point due to chelation.

B
Vapours of o-nitrophenol are carried by steam because its boiling point is reduced by steam.

C
Vapour of p-nitrophenol are carried by steam because of its lower boiling point.

D
Vapours of o-nitrophenol are carried by steam because of its lower boiling point and solubility in steam.

Solution

Only o-nitrophenol is capable of forming intramolecular H-bonding (chelation) which leads to its lower b.p. (less than 100°C) and also lower solubility in water (steam).
Question 5
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A mixture of two organic compounds A (boiling point 80°C) and
B (boiling point 110°C) can be separated by

A
Steam distillation

B
Fractional distillation

C
Sublimation

D
Fractional crystallization

Solution

Steam distillation can be applied only when one of the components has b.p. less than b.p. of water.
Question 6
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Which of the following can separate a mixture of sugar and common salt?

A
alcohol

B
petroleum ether

C
all the three

D
Water

Solution

Sugar and common salt, both are soluble in water and both are insoluble in petroleum ether hand, sugar is soluble in alcohol in petroleum ether hence these two solvents can’t be used. On the other hand, sugar is soluble in alcohol while sodium chloride is insoluble, hence the two can be separated by alcohol.

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Re-Attempt Weekly Quiz Competition

Practical Organic Chemistry Test - 1

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Practical Organic Chemistry Test - 1

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SHARING IS CARING

Question 1

Solid amines insoluble in water

Liquid amines soluble in water

All amines

Liquid amines insoluble in water

Solution

Question 2

Essential oils

A mixture of benzene (b.p. 353 K) and thiophene (b.p. 357 K)

A mixture of ethyl alcohol (b.p. 351 K) and water (b.p. 373 K)

A mixture of ether (b.p. 308 K) and toluene (b.p. 383 K)

Solution

Question 3

To decrease the vapour pressure of the liquid to be distilled

To dissolve the liquid due to high temperature

To increase the vapour pressure of the liquid to be distilled

To carry vapour of the liquid with it, it has nothing to do with the vapour pressure of the liquid

Solution

Question 4

Vapour of o-nitrophenol are carried by steam because of its lower boiling point due to chelation.

Vapours of o-nitrophenol are carried by steam because its boiling point is reduced by steam.

Vapour of p-nitrophenol are carried by steam because of its lower boiling point.

Vapours of o-nitrophenol are carried by steam because of its lower boiling point and solubility in steam.

Solution

Question 5

Steam distillation

Fractional distillation

Sublimation

Fractional crystallization

Solution

Question 6

alcohol

petroleum ether

all the three

Water

Solution

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