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Assertion & Reason Test: Haloalkanes & Haloarenes - 1


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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 SN1 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.

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

Alkyl halides give polyalkylation products.

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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