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Assertion & Reason Test: Haloalkanes & Haloarenes - 2 - NEET MCQ


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9 Questions MCQ Test Chemistry Class 12 - Assertion & Reason Test: Haloalkanes & Haloarenes - 2

Assertion & Reason Test: Haloalkanes & Haloarenes - 2 for NEET 2024 is part of Chemistry Class 12 preparation. The Assertion & Reason Test: Haloalkanes & Haloarenes - 2 questions and answers have been prepared according to the NEET exam syllabus.The Assertion & Reason Test: Haloalkanes & Haloarenes - 2 MCQs are made for NEET 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Assertion & Reason Test: Haloalkanes & Haloarenes - 2 below.
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Assertion & Reason Test: Haloalkanes & Haloarenes - 2 - Question 1

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.

Detailed Solution for Assertion & Reason Test: Haloalkanes & Haloarenes - 2 - Question 1

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.

Assertion & Reason Test: Haloalkanes & Haloarenes - 2 - Question 2

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.

Detailed Solution for Assertion & Reason Test: Haloalkanes & Haloarenes - 2 - Question 2

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.

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Assertion & Reason Test: Haloalkanes & Haloarenes - 2 - Question 3

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.

Detailed Solution for Assertion & Reason Test: Haloalkanes & Haloarenes - 2 - Question 3

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.

Assertion & Reason Test: Haloalkanes & Haloarenes - 2 - Question 4

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.

Detailed Solution for Assertion & Reason Test: Haloalkanes & Haloarenes - 2 - Question 4
Assertion: Addition of bromine to trans-2-butene yields meso-2, 3-dibromobutane.
Reason: Bromine addition to an alkene is an electrophilic addition.
Explanation:
- The assertion states that addition of bromine to trans-2-butene results in the formation of meso-2, 3-dibromobutane.
- This assertion is true because when bromine is added to trans-2-butene, it undergoes electrophilic addition where the bromine molecule adds to the double bond between carbon atoms 2 and 3, resulting in the formation of meso-2, 3-dibromobutane.
- The reason given is also true as bromine addition to an alkene is indeed an example of electrophilic addition, where the electron-rich double bond of the alkene acts as a nucleophile and attacks the electron-deficient bromine molecule.
- However, the reason does not directly explain why the specific product meso-2, 3-dibromobutane is formed. It only explains the mechanism of bromine addition to an alkene.
Therefore, the correct option is B: If both assertion and reason are true but reason is not the correct explanation of the assertion.
Assertion & Reason Test: Haloalkanes & Haloarenes - 2 - Question 5

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.

Detailed Solution for Assertion & Reason Test: Haloalkanes & Haloarenes - 2 - Question 5

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

Assertion & Reason Test: Haloalkanes & Haloarenes - 2 - Question 6

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

Assertion: Alkyl halides form alkenes when heated above300C.
Reason: CH3CH2I react slowly with strong base when compared to CD3CH2I.

Detailed Solution for Assertion & Reason Test: Haloalkanes & Haloarenes - 2 - Question 6

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.

Assertion & Reason Test: Haloalkanes & Haloarenes - 2 - Question 7

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.

Detailed Solution for Assertion & Reason Test: Haloalkanes & Haloarenes - 2 - Question 7

 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.

Assertion & Reason Test: Haloalkanes & Haloarenes - 2 - Question 8

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.

Detailed Solution for Assertion & Reason Test: Haloalkanes & Haloarenes - 2 - Question 8

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

Assertion & Reason Test: Haloalkanes & Haloarenes - 2 - Question 9

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.

Detailed Solution for Assertion & Reason Test: Haloalkanes & Haloarenes - 2 - Question 9

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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