Haloalkanes and Haloarenes Test 19

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Haloalkanes and Haloarenes Test 19

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Question 1
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Directions: These questions consist of two statements, each printed as Assertion and Reason. While answering these questions, you are required to choose any one of the following four responses.

Assertion : SN² reaction of an optically active aryl halide with an aqueous solution of KOH always gives an alcohol with opposite sign of rotation.
Reason : SN² reactions always proceed with inversion of configuration.

A
If both Assertion and Reason are correct and the Reason is a correct explanation of the Assertion.

B
If both Assertion and Reason are correct but Reason is not a correct explanation of the Assertion.

C
If the Assertion is correct but Reason is incorrect.

D
If both the Assertion and Reason are incorrect.

Solution

Assertion is false, because aryl halides do not undergo nucleophilic substitution under ordinary conditions. This is due to resonance, because of which the carbon– chlorine bond acquires partial double bond character, hence it becomes shorter and stronger and thus cannot be replaced by nucleophiles. However Reason is true.
Question 2
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Directions: These questions consist of two statements, each printed as Assertion and Reason. While answering these questions, you are required to choose any one of the following four responses.

Assertion : Exposure of ultraviolet rays to humans causes skin cancer, disorder and disrupts the immune system.
Reason : Carbon tetrachloride is released into air it rises to the atmosphere and depletes the ozone layer.

A
If both Assertion and Reason are correct and the Reason is a correct explanation of the Assertion.

B
If both Assertion and Reason are correct but Reason is not a correct explanation of the Assertion.

C
If the Assertion is correct but Reason is incorrect.

D
If both the Assertion and Reason are incorrect.

Solution

Carbon tetrachloride rises to the atmosphere and deplete the ozone layer. This depletion of ozone layer increases exposure of UV rays to human being which lead to increase of skin cancer, eye diseases and disorder with disruption of the immune system.
Question 3
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Directions: These questions consist of two statements, each printed as Assertion and Reason. While answering these questions, you are required to choose any one of the following four responses.

Assertion : CCl₄ is not a fire extinguisher.
Reason : CCl₄ is insoluble in water.

A
If both Assertion and Reason are correct and the Reason is a correct explanation of the Assertion.

B
If both Assertion and Reason are correct but Reason is not a correct explanation of the Assertion.

C
If the Assertion is correct but Reason is incorrect.

D
If both the Assertion and Reason are incorrect.

Solution

CCl₄ is used as a fire extinguisher. The dense, non combustible vapours cover the burning substance and prevent the availability of oxygen around burning material.
Question 4
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Read the assertion and reason carefully to mark the correct option out of the options given below:

Assertion: Addition of bromine to trans-2-butene yields meso-2, 3-dibromobutane
Reason: Bromine addition to an alkene is an electrophilic addition.

A
If both assertion and reason are true and the reason is the correct explanation of the assertion.

B
If both assertion and reason are true but reason is not the correct explanation of the assertion.

C
If the assertion is true but the reason is false.

D
If the assertion and reason both are false.
Question 5
1 / -0

Read the assertion and reason carefully to mark the correct option out of the options given below:

Assertion: CCl₄ is not a fire extinguisher.
Reason: CCl₄ is insoluble in water.

A
If both assertion and reason are true and the reason is the correct explanation of the assertion.

B
If both assertion and reason are true but reason is not the correct explanation of the assertion.

C
If the assertion is true but the reason is false.

D
If the assertion is false but the reason is true.

Solution

CCl₄ is used as a fire extinguisher. The dense, noncombustible vapours cover the burning substance and prevent the availability of oxygen round burning material.
Question 6
1 / -0

Read the assertion and reason carefully to mark the correct option out of the options given below:

Assertion: Alkyl halides form alkenes when heated above300^∘C.
Reason: CH₃CH₂I react slowly with strong base when compared to CD₃CH₂I.

A
If both assertion and reason are true and the reason is the correct explanation of the assertion.

B
If both assertion and reason are true but reason is not the correct explanation of the assertion.

C
If assertion is true but reason is false.

D
If the assertion and reason both are false.

Solution

CH₃CH₂I reacts more rapidly with strong base in comparison to CD₃CH₂I. The elimination of HI (or DI) in presence of strong base shows E₂ elimination. The rate determining step involves the breaking up of C-H (or C-D) bond. The C-D bond being stronger than C-H and thus elimination is faster in case of CH₃CH₂I.
Question 7
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Read the assertion and reason carefully to mark the correct option out of the options given below:

Assertion: is less reactivethan towards reactions.
Reason: Tertiary alkyl halides react predominantly by SN1 mechanism.

A
If both assertion and reason are true and the reason is the correct explanation of the assertion.

B
If both assertion and reason are true but reason is not the correct explanation of the assertion.

C
If assertion is true but reason is false.

D
If assertion is false but reason is true.

Solution

is more reactive than because the former is a tertiary alkyl halide and the latter is a secondary alkyl halide. Tertiary alkyl halides react predominantly by SN1 mechanism.
Question 8
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Read the assertion and reason carefully to mark the correct option out of the options given below:

Assertion: Aryl halides undergo electrophilic substitutions more readily than benzene.
Reason: Aryl halide gives a mixture of o- and p- products.

A
If both assertion and reason are true and the reason is the correct explanation of the assertion.

B
If both assertion and reason are true but reason is not the correct explanation of the assertion.

C
If assertion is true but reason is false.

D
If assertion is false but reason is true.

Solution

Halogens are somewhat deactivating but o, p-directing. As a result, aryl halides undergo the usual electrophilic substitution reactions less readily than benzene.
Question 9
1 / -0

Read the assertion and reason carefully to mark the correct option out of the options given below:

Assertion: Optically active 2-iodobutane on treatment with NaI in acetone undergoes racemization.
Reason: Repeated Walden inversions on the reactant and its product eventually gives a racemic mixture.

A
If both assertion and reason are true and the reason is the correct explanation of the assertion.

B
If both assertion and reason are true but reason is not the correct explanation of the assertion.

C
If assertion is true but reason is false.

D
If the assertion and reason both are false.

Solution

Optically active 2-iodobutane on treatment with NaI in acetone undergoes racemisation.
Repeated Walden inversions on the reactant and its product eventually gives a racemic mixture.

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Re-Attempt Weekly Quiz Competition

Haloalkanes and Haloarenes Test 19

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Haloalkanes and Haloarenes Test 19

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SHARING IS CARING

Question 1

If both Assertion and Reason are correct and the Reason is a correct explanation of the Assertion.

If both Assertion and Reason are correct but Reason is not a correct explanation of the Assertion.

If the Assertion is correct but Reason is incorrect.

If both the Assertion and Reason are incorrect.

Solution

Question 2

If both Assertion and Reason are correct and the Reason is a correct explanation of the Assertion.

If both Assertion and Reason are correct but Reason is not a correct explanation of the Assertion.

If the Assertion is correct but Reason is incorrect.

If both the Assertion and Reason are incorrect.

Solution

Question 3

If both Assertion and Reason are correct and the Reason is a correct explanation of the Assertion.

If both Assertion and Reason are correct but Reason is not a correct explanation of the Assertion.

If the Assertion is correct but Reason is incorrect.

If both the Assertion and Reason are incorrect.

Solution

Question 4

If both assertion and reason are true and the reason is the correct explanation of the assertion.

If both assertion and reason are true but reason is not the correct explanation of the assertion.

If the assertion is true but the reason is false.

If the assertion and reason both are false.

Question 5

If both assertion and reason are true and the reason is the correct explanation of the assertion.

If both assertion and reason are true but reason is not the correct explanation of the assertion.

If the assertion is true but the reason is false.

If the assertion is false but the reason is true.

Solution

Question 6

If both assertion and reason are true and the reason is the correct explanation of the assertion.

If both assertion and reason are true but reason is not the correct explanation of the assertion.

If assertion is true but reason is false.

If the assertion and reason both are false.

Solution

Question 7

If both assertion and reason are true and the reason is the correct explanation of the assertion.

If both assertion and reason are true but reason is not the correct explanation of the assertion.

If assertion is true but reason is false.

If assertion is false but reason is true.

Solution

Question 8

If both assertion and reason are true and the reason is the correct explanation of the assertion.

If both assertion and reason are true but reason is not the correct explanation of the assertion.

If assertion is true but reason is false.

If assertion is false but reason is true.

Solution

Question 9

If both assertion and reason are true and the reason is the correct explanation of the assertion.

If both assertion and reason are true but reason is not the correct explanation of the assertion.

If assertion is true but reason is false.

If the assertion and reason both are false.

Solution

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