Q 1 :    

Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R).

Assertion (A):  undergoes ${\mathrm{S}}_{\mathrm{N}}2$ reaction faster than .

Reason (R): Iodine is a better leaving group because of its large size.

In the light of the above statements, choose the correct answer from the options given below:         [2025]

• A is true but R is false.

   

• A is false but R is true.

   

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

   

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

   

Q 2 :    

How many products (including stereoisomers) are expected from monochlorination of the following compound?         [2025]

• 5

   

• 6

   

• 2

   

• 3

   

Q 3 :    

The major product C in the below mentioned reaction is           [2024]

${\mathrm{CH}}_3{\mathrm{CH}}_2{\mathrm{CH}}_2\mathrm{Br} \underset{\Delta }{\overset{\text{alc. KOH}}{\to }}A \stackrel{\text{HBr}}{\to }B \underset{\Delta }{\overset{\text{aq. KOH}}{\to }}C$

• propan-1-ol

   

• propan-2-ol

   

• propane

   

• propyne

   

Q 4 :    

The compound that will undergo ${\mathrm{S}}_{\mathrm{N}}1$ reaction with the fastest rate is          [2024]

Q 5 :    

Major products A and B formed in the following reaction sequence are         [2024]

Q 6 :    

Identify ‘X’ in the following reaction.                [2023]

Q 7 :    

The correct order for the rate of $\mathrm{\alpha },\mathrm{\beta }$-dehydrohalogenation for the following compounds is _______.         [2023]

• (i) < (ii) < (iii)

   

• (ii) < (i) < (iii)

   

• (iii) < (ii) < (i)

   

• (ii) < (iii) < (i)

   

Q 8 :    

Which amongst the following reactions of alkyl halides produces isonitrile as a major product?

A)  $\mathrm{R}-\mathrm{X}+\mathrm{HCN}⟶$ 
B)  $\mathrm{R}-\mathrm{X}+\mathrm{AgCN}⟶$ 
C)  $\mathrm{R}-\mathrm{X}+\mathrm{KCN}⟶$ 
D)  $\mathrm{R}-\mathrm{X}+\mathrm{NaCN}\underset{{\mathrm{C}}_2{\mathrm{H}}_5\mathrm{OH}}{\overset{{\mathrm{H}}_2\mathrm{O}}{\to }}$

Choose the most appropriate answer from the options given below:              [2023]

• (D) only

   

• (C) and (D) only

   

• (B) only

   

• (A) and (B) only

   

Q 9 :    

The incorrect statement regarding chirality is             [2022]

• ${\mathrm{S}}_{\mathrm{N}}1$ reaction yields 1 : 1 mixture of both enantiomers

   

• the product obtained by ${\mathrm{S}}_{\mathrm{N}}2$ reaction of haloalkane having chirality at the reactive site shows inversion of configuration

   

• enantiomers are superimposable mirror images of each other

   

• a racemic mixture shows zero optical rotation

   

Q 10 :    

The major product formed in dehydrohalogenation reaction of 2-bromopentane is pent-2-ene. This product formation is based on?         [2021]

• Huckel’s Rule

   

• Saytzeff’s Rule

   

• Hund’s Rule

   

• Hofmann Rule