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Topic Question Set

Q 1 :

Consider the following molecules:

The correct order of rate of hydrolysis is:                  [2025]

  • r > q > p > s

     

  • q > p > r > s

     

  • p > r > q > s

     

  • p > q > r > s

     

(4)

Hydrolysis of acid derivatives is a nucleophilic elimination reaction. For such reactions rate of reaction is acid chloride > anhydride > ester > amide.

 

Q 2 :

Assertion A: Hydrolysis of an alkyl chloride is a slow reaction but in the presence of NaI, the rate of the hydrolysis increases.

Reason R: I- is a good nucleophile as well as a good leaving group.

In the light of the above statements, choose the correct answer from the options given below:             [2023]

  • A is false but R is true

     

  • A is true but R is false

     

  • Both A and R are true but R is NOT the correct explanation of A

     

  • Both A and R are true and R is the correct explanation of A

     

(4)

I- being a good nucleophile forms R–I which gets hydrolysed readily.

Q 3 :

The compound which will have the lowest rate towards nucleophilic aromatic substitution on treatment with OH- is                   [2023]

  • [IMAGE 44]

     

  • [IMAGE 45]

     

  • [IMAGE 46]

     

  • [IMAGE 47]

     

(2)

[IMAGE 48]

Chlorobenzene with strong EWG (i.e., –NO2) undergoes nucleophilic aromatic substitution at a faster rate with OH-.

Q 4 :

Decreasing order towards SN1 reaction for the following compounds is:         [2023]

[IMAGE 49]

  • d > b > c > a

     

  • b > d > c > a

     

  • a > c > d > b

     

  • a > b > c > d

     

(2)

Rate of SN1 depends upon stability of carbocation.

Q 5 :

The correct order of reactivity of following haloarenes towards nucleophilic substitution with aqueous NaOH is:

[IMAGE 50]

Choose the correct answer from the options given below:                  [2023]

  • D > C > B > A

     

  • A > B > D > C

     

  • C > A > D > B

     

  • D > B > A > C

     

(4)

Chlorobenzene undergoes aromatic nucleophilic substitution via carbanion intermediate. In such a reaction greater the –M group (–NO2, –CN etc.) at o and p-position, greater the stability of carbanion intermediate and faster the rate of reaction.

Q 6 :

Arrange the following compounds in increasing order of rate of aromatic electrophilic substitution reaction.      [2023]

[IMAGE 51]

  • d, b, a, c

     

  • b, c, a, d

     

  • c, a, b, d

     

  • d, b, c, a

     

(3)

Due to increase in electron density in the ring, rate of ArSE2 increases, ERG increases the electron density.

Q 7 :

Decreasing order of reactivity towards electrophilic substitution for the following compounds is:         [2023]

[IMAGE 52]

  • a > d > e > b > c

     

  • d > a > e > c > b

     

  • e > d > a > b > c

     

  • c > b > a > d > e

     

(3)

Higher the electron density on benzene ring, higher is its reactivity towards electrophilic substitution reaction.

Rate∝EDG∝1EWQ

Hence, the correct order is  e>d>a>b>c.

Q 8 :

Correct statements for the given reaction are:

[IMAGE 53]--------

(A) Compound ‘B’ is aromatic

(B) The completion of above reaction is very slow

(C) ‘A’ shows tautomerism

(D) The bond length of C–C in compound B are found to be same

Choose the correct answer from the options given below:                  [2023]

  • A, C and D only

     

  • A, B and C only

     

  • A, B and D only

     

  • B, C and D only

     

(1)

[IMAGE 54]

Compound (A) shows tautomerism.