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O.P Tandon Test: Haloalkanes & Haloarenes - JEE MCQ


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30 Questions MCQ Test - O.P Tandon Test: Haloalkanes & Haloarenes

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O.P Tandon Test: Haloalkanes & Haloarenes - Question 1

(i) CH3 – CH2 – Br + NaOH  CH3 – CH2 – OH + NaBr → reaction ... (i)

(ii)  + NaOH  (CH3)C – CH2 – OH + NaBr → reaction ... (ii)

K1 & K2 are rate constant for above reaction correct relation is

Detailed Solution for O.P Tandon Test: Haloalkanes & Haloarenes - Question 1



This reaction is not proceed in forward direction.

O.P Tandon Test: Haloalkanes & Haloarenes - Question 2

Free energy profile for given reaction is

Detailed Solution for O.P Tandon Test: Haloalkanes & Haloarenes - Question 2


 (Reaction will be proceed in forward direction)

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O.P Tandon Test: Haloalkanes & Haloarenes - Question 3

Which of the following alcohols will yield the corresponding alkyl chloride on reaction with concentrated HCl at room temperature?

Detailed Solution for O.P Tandon Test: Haloalkanes & Haloarenes - Question 3

Option D is correct.
At room temperature more stable carbocation is formed by any alkyl halide then that will give a stable and more efficient product.
Formation of  3o carbocation as intermediate during reaction which is highly stable,this reaction does not require any heating to occur at only room temperature.

O.P Tandon Test: Haloalkanes & Haloarenes - Question 4

 (A),

Major-product (A) is

Detailed Solution for O.P Tandon Test: Haloalkanes & Haloarenes - Question 4


This is SN2 reaction (Halide exchange method)

O.P Tandon Test: Haloalkanes & Haloarenes - Question 5

(A), Product (A) is

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O.P Tandon Test: Haloalkanes & Haloarenes - Question 6

Which of the following ethers is unlikely to be cleaved by hot conc. HBr ?

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(D) 

O.P Tandon Test: Haloalkanes & Haloarenes - Question 7

The reaction of CH3OC2H5 with one mole HI gives

Detailed Solution for O.P Tandon Test: Haloalkanes & Haloarenes - Question 7

The correct answer is option C
When ethers are treated with a strong acid in the presence of a nucleophile, they can be cleaved to give alcohols and alkyl halides. If the ether is on a primary carbon this may occur through an SN2​ pathway. The reaction of CH3​OC2​H5​ with HI gives CH3​I+C2​H5​OH.

O.P Tandon Test: Haloalkanes & Haloarenes - Question 8

Under identical conditions, solvolysis of which of the following substrates would lead to maximum racemization ?

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O.P Tandon Test: Haloalkanes & Haloarenes - Question 9

The reaction of SOCl2 on alkanols to form alkyl chlorides gives good yields because

Detailed Solution for O.P Tandon Test: Haloalkanes & Haloarenes - Question 9


side product   of this reaction are escape out from reaction mixture. So product (alkyl chloride) are occurs in good yield. This is best method for formation of alkyl halide.

O.P Tandon Test: Haloalkanes & Haloarenes - Question 10

Which of the following alcohol shows fastest reaction with HI ?

Detailed Solution for O.P Tandon Test: Haloalkanes & Haloarenes - Question 10





in above reaction corbocation is formed as intermediate. So rate of reaction stability of carbocation in above option most stable corbocation will formed that reaction will be fast.

O.P Tandon Test: Haloalkanes & Haloarenes - Question 11

Arrange the following compounds in order of decreasing rate of hydrolysis for SN1 reaction

(I) 
 (II) 
(III) 
(IV) 

Detailed Solution for O.P Tandon Test: Haloalkanes & Haloarenes - Question 11

Order of decreasing rate of hydrolysis for SN1 reaction in SN1 reaction intermediate corbocation is formed.





decreasing stability order of following corbocation.

O.P Tandon Test: Haloalkanes & Haloarenes - Question 12

For the given reaction ;

Which substrate will give maximum racemisation

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Maximum reacemisation stability of corbocation when substrate having chiral carbon.

O.P Tandon Test: Haloalkanes & Haloarenes - Question 13

Which of these dehydrates most readily when reacts with conc. H3PO4.

Detailed Solution for O.P Tandon Test: Haloalkanes & Haloarenes - Question 13

(A) 
(B) 
(C) 
(D) 

O.P Tandon Test: Haloalkanes & Haloarenes - Question 14

 (P)

(Major). Major product (P) is :

Detailed Solution for O.P Tandon Test: Haloalkanes & Haloarenes - Question 14


O.P Tandon Test: Haloalkanes & Haloarenes - Question 15

Which of following halides gives fastest elimination reaction when it is treated with alcoholic KOH.

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O.P Tandon Test: Haloalkanes & Haloarenes - Question 16

Which alkyl bromide will yield only one alkene upon E2 elimination ?

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O.P Tandon Test: Haloalkanes & Haloarenes - Question 17

  

which is most easily dehydrohalogenated ?

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O.P Tandon Test: Haloalkanes & Haloarenes - Question 18

Correct order of yield of Hofmann alkene in following reaction will be

 X may be F, Cl Br or l

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 (bad leaving group) give Haffmann alkene order of X for Hofmann alkene → F > Cl > Br > I

O.P Tandon Test: Haloalkanes & Haloarenes - Question 19

Predict the major product of the following reaction :

 

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O.P Tandon Test: Haloalkanes & Haloarenes - Question 20

  major product having aH

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*Multiple options can be correct
O.P Tandon Test: Haloalkanes & Haloarenes - Question 21

Which of the following compound will not undergo Nucleophillic substitution reaction.

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*Multiple options can be correct
O.P Tandon Test: Haloalkanes & Haloarenes - Question 22

Rate of SN2 will be negligible in

Detailed Solution for O.P Tandon Test: Haloalkanes & Haloarenes - Question 22




*Multiple options can be correct
O.P Tandon Test: Haloalkanes & Haloarenes - Question 23

Statement 1 : On moving 1° to 3° alkyl halide rate of E2 increases while rate of SN2 decreases

Statement 2 : E2 reaction give element effect respect to halogen.

Detailed Solution for O.P Tandon Test: Haloalkanes & Haloarenes - Question 23

Both statement are correct

*Multiple options can be correct
O.P Tandon Test: Haloalkanes & Haloarenes - Question 24

 Product of above reaction is

Detailed Solution for O.P Tandon Test: Haloalkanes & Haloarenes - Question 24



*Multiple options can be correct
O.P Tandon Test: Haloalkanes & Haloarenes - Question 25

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O.P Tandon Test: Haloalkanes & Haloarenes - Question 26

SN1 is a two-step reaction. For each step, there has to be a transition state. Which of the following structures represent correctly the transition state of first step

Detailed Solution for O.P Tandon Test: Haloalkanes & Haloarenes - Question 26

SN1 is two step reaction.
First step : Formation of carbocation

O.P Tandon Test: Haloalkanes & Haloarenes - Question 27

Which one of the following compounds will give enantiomeric pair on treatment with HOH?

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O.P Tandon Test: Haloalkanes & Haloarenes - Question 28

Which of the following compounds is most rapidly hydrolysed by SN1 mechanism

Detailed Solution for O.P Tandon Test: Haloalkanes & Haloarenes - Question 28

Following comp. is most rapidly hydrolysed by SN1 mechanism.


Most stable corbocation will be more rapidly hydrolysed by SN1 mechanism.

O.P Tandon Test: Haloalkanes & Haloarenes - Question 29

Which will give white ppt. with AgNO?

Detailed Solution for O.P Tandon Test: Haloalkanes & Haloarenes - Question 29

Following comp. gives white ppt with AgNO3 which formed more stable corbocation.

O.P Tandon Test: Haloalkanes & Haloarenes - Question 30

  A. A is :

Detailed Solution for O.P Tandon Test: Haloalkanes & Haloarenes - Question 30


(T.S will be stable  due to electron cloud of p orbital) 

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