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NEET Exam  >  NEET Tests  >  Daily Test for NEET Preparation  >  Test: Methods of Preparation of Haloalkanes and Haloarenes (January 25) - NEET MCQ

Test: Methods of Preparation of Haloalkanes and Haloarenes (January 25) - NEET MCQ


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Test: Methods of Preparation of Haloalkanes and Haloarenes (January 25) for NEET 2024 is part of Daily Test for NEET Preparation preparation. The Test: Methods of Preparation of Haloalkanes and Haloarenes (January 25) questions and answers have been prepared according to the NEET exam syllabus.The Test: Methods of Preparation of Haloalkanes and Haloarenes (January 25) MCQs are made for NEET 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Methods of Preparation of Haloalkanes and Haloarenes (January 25) below.
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Test: Methods of Preparation of Haloalkanes and Haloarenes (January 25) - Question 1
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On free radical chlorination reaction of butane, how many different, optically active, dichloroalkanes would be formed ?


Detailed Solution for Test: Methods of Preparation of Haloalkanes and Haloarenes (January 25) - Question 1




Only three pairs of enantiomers are formed.

Test: Methods of Preparation of Haloalkanes and Haloarenes (January 25) - Question 2
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The yield of alkyl bromide obtained as a result of heating the dry silver salt of carboxylic acid with bromine in CCI4 is

Detailed Solution for Test: Methods of Preparation of Haloalkanes and Haloarenes (January 25) - Question 2

The reaction follows free radical mechanism and alkyl free radical is formed in the propagation step as



Hence, stability of alkyl free radical (3° > 2° > 1°) determine the reactivity.

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Test: Methods of Preparation of Haloalkanes and Haloarenes (January 25) - Question 3
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Which is incorrect about Hunsdiecker's reaction?

Detailed Solution for Test: Methods of Preparation of Haloalkanes and Haloarenes (January 25) - Question 3

Except F2, almost all halogens react with RCOOAg giving alkyl halide via Hunsdiecker reaction.

With l2 if RCOOAg is in excess, R— I formed in the first step reacts further with unreacted salt to give ester as
R—COOAg + R—I → R—COOR + AgI

Test: Methods of Preparation of Haloalkanes and Haloarenes (January 25) - Question 4
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One or More than One Options Correct Type

Direction (Q. Nos. 8-12) This section contains 5 multiple choice questions. Each question has four choices (a), (b), (c) and (d), out of which ONE or MORE THAN ONE are correct.

Q. Which of the following reagents can bring about free radical chlorination of propane?
Detailed Solution for Test: Methods of Preparation of Haloalkanes and Haloarenes (January 25) - Question 4

Both SO2CI2 and Cl2 undergo homolytic bond fission when heated or irradiated with light.

*Multiple options can be correct
Test: Methods of Preparation of Haloalkanes and Haloarenes (January 25) - Question 5
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Choose the correct statement(s) from the following regarding free radical chlorination and bromination reaction of alkane.
Detailed Solution for Test: Methods of Preparation of Haloalkanes and Haloarenes (January 25) - Question 5

In free radical halogenation of alkane, the first step of propagation is exothermic when Cl2 is used while it is endothermic when Br2 is used. Also chlorination occur at very fast rate, hence very less selective while bromination occur at very slow rate, occurs selectively where most stable free radical is formed.

Test: Methods of Preparation of Haloalkanes and Haloarenes (January 25) - Question 6
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An alcohol (R — OH) can be converted into alkyl chloride by the treatm ent with HCI. Reaction involves protonation of alcohol followed by the formation of carbocation intermediate. Carbocation intermediate in the final step undergo nucleophilic attack by Cl- ion as :

Q. 

What is the correct order of reactivty of the followings with HCl? 

 

      

 

    
Detailed Solution for Test: Methods of Preparation of Haloalkanes and Haloarenes (January 25) - Question 6

The order of stability of carbocation intermediates formed follows the order of reactivity.

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Test: Methods of Preparation of Haloalkanes and Haloarenes (January 25) - Question 7
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If 1, 3-butadiene is treated with excess of bromine in CCI4 , how many different tetrabromides would be formed?

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Test: Methods of Preparation of Haloalkanes and Haloarenes (January 25) - Question 8
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Consider the following reaction,

Q. 

How many different monobromo derivatives would be produced?

Detailed Solution for Test: Methods of Preparation of Haloalkanes and Haloarenes (January 25) - Question 8


(I) has two optically active enantiomers and (II) has two geometrical isomers.

Test: Methods of Preparation of Haloalkanes and Haloarenes (January 25) - Question 9
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Addition of bromine on propene in the presence of brine yields a mixture of
Detailed Solution for Test: Methods of Preparation of Haloalkanes and Haloarenes (January 25) - Question 9



Nucleophilic attack in step-ll occur at the carbon atom which can better accommodate the positive charge. Hence, attack of Br- or Cl- in second step occur at 2° carbon rather that at 1° carbon.

Test: Methods of Preparation of Haloalkanes and Haloarenes (January 25) - Question 10
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The major product of the following reaction is 
Detailed Solution for Test: Methods of Preparation of Haloalkanes and Haloarenes (January 25) - Question 10

Free radical bromination occur. Preferably at highest degree carbon where most stable free radical is formed.

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