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Assertion & Reason Test: Haloalkanes & Haloarenes - 1 - NEET MCQ


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10 Questions MCQ Test Chemistry Class 12 - Assertion & Reason Test: Haloalkanes & Haloarenes - 1

Assertion & Reason Test: Haloalkanes & Haloarenes - 1 for NEET 2024 is part of Chemistry Class 12 preparation. The Assertion & Reason Test: Haloalkanes & Haloarenes - 1 questions and answers have been prepared according to the NEET exam syllabus.The Assertion & Reason Test: Haloalkanes & Haloarenes - 1 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 - 1 below.
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Assertion & Reason Test: Haloalkanes & Haloarenes - 1 - Question 1

Directions: In the following questions, A statement of Assertion (A) is followed by a statement of Reason (R). Mark the correct choice as.

Assertion (A): Hydrolysis of (–)-2-bromooctane proceeds with inversion of configuration.
Reason (R): This reaction proceeds through the formation of a carbocation.

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

Hydrolysis of (–)-2-bromooctane proceeds through the formation of a carbocation following SN2 reaction.

Assertion & Reason Test: Haloalkanes & Haloarenes - 1 - Question 2

Directions: In the following questions, A statement of Assertion (A) is followed by a statement of Reason (R). Mark the correct choice as.

Assertion: Phosphorus chlorides (tri and penta) are preferred over thionyl chloride for the preparation of alkyl chlorides from alcohols.
Reason: Phosphorus chlorides give pure alkyl halides.

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

Thionyl chloride is best halogen carrier to convert alcohol to alkyl halide because it gives by-products in gaseous state. Thus, we get pure alkyl halide in this reaction.

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Assertion & Reason Test: Haloalkanes & Haloarenes - 1 - Question 3

Directions: In the following questions, A statement of Assertion (A) is followed by a statement of Reason (R). Mark the correct choice as.

Assertion (A): In monohaloarenes, further electrophilic substitution occurs at ortho and para positions.
Reason (R): Halogen atom is a ring deactivator.

Detailed Solution for Assertion & Reason Test: Haloalkanes & Haloarenes - 1 - Question 3

Halogens are ortho-para directing due to (+M) or (+R) effect. Moreover, they are deactivating due to high electronegativity.

Assertion & Reason Test: Haloalkanes & Haloarenes - 1 - Question 4

 Directions: In the following questions, A statement of Assertion (A) is followed by a statement of Reason (R). Mark the correct choice as.

Assertion (A): Aryl iodides can be prepared by reaction of arenes with iodine in the presence of an oxidising agent.
Reason (R): Oxidising agent oxidises I2 into HI.

Detailed Solution for Assertion & Reason Test: Haloalkanes & Haloarenes - 1 - Question 4

Oxidising agent like (HIO3) converts HI to I2 otherwise HI may reduce aryl halide to arenes.
5HI + HIO3 → 3H2O + 3I2

Assertion & Reason Test: Haloalkanes & Haloarenes - 1 - Question 5

Directions: In the following questions, A statement of Assertion (A) is followed by a statement of Reason (R). Mark the correct choice as.

Assertion (A): Aryl halides undergo nucleophilic substitution reactions with ease.
Reason(R): The carbon halogen bond in aryl halides has partial double bond character

Detailed Solution for Assertion & Reason Test: Haloalkanes & Haloarenes - 1 - Question 5

Aryl halides are less reactive towards nucleophilic substitution reactions because of the carbon halogen bond in aryl halides has partial double bond character.

Assertion & Reason Test: Haloalkanes & Haloarenes - 1 - Question 6

Directions: In the following questions, A statement of Assertion (A) is followed by a statement of Reason (R). Mark the correct choice as.

Assertion (A): tert-Butyl bromide undergoes Wurtz reaction to give 2, 2, 3, 3-tetramethylbutane.
Reason (R): In Wurtz reaction, alkyl halides react with sodium in dry ether to give hydrocarbon containing double the number of carbon atoms present in the halide.

Detailed Solution for Assertion & Reason Test: Haloalkanes & Haloarenes - 1 - Question 6

In Wurtz reaction, alkyl halides react with sodium in dry ether to give hydrocarbon containing double the number of carbon atoms present in the halide so tert-Butyl bromide undergoes Wurtz reaction to give 2, 2, 3, 3-tetramethylbutane.

Assertion & Reason Test: Haloalkanes & Haloarenes - 1 - Question 7

Directions: In the following questions, A statement of Assertion (A) is followed by a statement of Reason (R). Mark the correct choice as.

Assertion (A): Presence of a nitro group at ortho or para position increases the reactivity of haloarenes towards nucleophilic substitution.
Reason (R): Nitro group, being an electron withdrawing group decreases the electron density over the benzene ring.

Detailed Solution for Assertion & Reason Test: Haloalkanes & Haloarenes - 1 - Question 7

Nitro group being an electron withdrawing group, decreases the electron density of benzene ring thus increasing the reactivity of haloarenes towards nucleophilic substitution.

Assertion & Reason Test: Haloalkanes & Haloarenes - 1 - Question 8

Directions: In the following questions, A statement of Assertion (A) is followed by a statement of Reason (R). Mark the correct choice as.

Assertion (A): It is difficult to replace chlorine by –OH in chlorobenzene in comparison to that in chloroethane.
Reason (R): Carbon-chlorine (C—Cl) bond in chlorobenzene has a partial double bond character due to resonance.

Detailed Solution for Assertion & Reason Test: Haloalkanes & Haloarenes - 1 - Question 8

Chlorobenzene is very less reactive to nucleophilic substitution reaction by – OH group as Carbon-chlorine (C—Cl) bond in chlorobenzene has a partial double bond character due to resonance.

Assertion & Reason Test: Haloalkanes & Haloarenes - 1 - Question 9

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 : Alkylbenzene is not prepared by Friedel-Crafts alkylation of benzene.
Reason : Alkyl halides are less reactive than acyl halides.
 

Detailed Solution for Assertion & Reason Test: Haloalkanes & Haloarenes - 1 - Question 9

Assertion: Alkylbenzene is not prepared by Friedel-Crafts Alkylation of benzene
The monoalkyl derivative that is first formed readily undergoes further alkylation fast in order to prepare polysubstituted products and isomeric change may occur to alkyl halide and separation of the products is not easy. Due to these obstacles, Friedel-Crafts alkylation of benzene does not prepare alkyl benzene.
Reason: Alkyl halides are less reactive than acyl halides
The C atoms of alkyl halides are less electrophilic than the C atom of carbonyl. So, Alkyl halides are less reactive than acyl halides.

Assertion & Reason Test: Haloalkanes & Haloarenes - 1 - Question 10

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 : CHCl3 is stored in dark bottles.
Reason : CHCl3 is oxidised in dark.

Detailed Solution for Assertion & Reason Test: Haloalkanes & Haloarenes - 1 - Question 10

CHCl3 is stored in dark bottles to prevent oxidation of CHCl3 in the presence of sunlight.
 

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