Q 1 :    

The correct statement regarding nucleophilic substitution reaction in a chiral alkyl halide is:                   [2024]

• Racemisation occurs in ${\mathrm{S}}_{\mathrm{N}}1$ reaction and inversion occurs in ${\mathrm{S}}_{\mathrm{N}}2$ reaction.

   

• Racemisation occurs in ${\mathrm{S}}_{\mathrm{N}}1$ reaction and retention occurs in ${\mathrm{S}}_{\mathrm{N}}2$ reaction.

   

• Retention occurs in ${\mathrm{S}}_{\mathrm{N}}1$ reaction and inversion occurs in ${\mathrm{S}}_{\mathrm{N}}2$ reaction.

   

• Racemisation occurs in both ${\mathrm{S}}_{\mathrm{N}}1$ and ${\mathrm{S}}_{\mathrm{N}}2$ reactions.

   

Q 2 :    

Given below are two statements:

Statement-I: High concentration of strong nucleophilic reagent with secondary alkyl halides which do not have bulky substituents will follow ${{\mathrm{S}}_{\mathrm{N}}}^2$ mechanism.

Statement-II: A secondary alkyl halide when treated with a large excess of ethanol follows ${{\mathrm{S}}_{\mathrm{N}}}^1$ mechanism.

In the light of the above statements, choose the most appropriate from the options given below:                      [2024]

• Statement I is true but Statement II is false.

   

• Statement I is false but Statement II is true.

   

• Both Statement I and Statement II are false.

   

• Both Statement I and Statement II are true.

   

Q 3 :    

Given below are two statements:

Statement (I): ${\mathrm{S}}_{\mathrm{N}}2$ reactions are 'stereospecific', indicating that they result in the formation of only one stereo-isomer as the product.

Statement (II): ${\mathrm{S}}_{\mathrm{N}}1$ reactions generally result in formation of product as racemic mixtures.

In the light of the above statements, choose the correct answer from the options given below:                    [2024]

• Both Statement I and Statement II are true

   

• Statement I is false but Statement II is true

   

• Both Statement I and Statement II are false

   

• Statement I is true but Statement II is false

   

Q 4 :    

Which among the following halide/s will not show $S_{N}1$ reaction:                                    [2024]

Choose the most appropriate answer from the options given below:

• (A), (B) and (D) only

   

• (A) and (B) only

   

• (B) and (C) only

   

• (B) only

   

Q 5 :    

Alkyl halide is converted into alkyl isocyanide by reaction with:                       [2024]

• NaCN

   

• AgCN

   

• ${\mathrm{NH}}_4\mathrm{CN}$

   

• KCN

   

Q 6 :    

The product (C) in the below-mentioned reaction is:                     [2024]

• Propene

   

• Propan-2-ol

   

• Propyne

   

• Propan-1-ol

   

Q 7 :    

Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R).                                             [2024]
Assertion (A): Haloalkanes react with KCN to form alkyl cyanides as a main product while with AgCN form isocyanide as the main product.

Reason (R): KCN and AgCN both are highly ionic compounds.

In the light of the above statements, choose the most appropriate answer from the options given below:

• (A) is correct but (R) is not correct

   

• Both (A) and (R) are correct but (R) is not the correct explanation of (A)

   

• (A) is not correct but (R) is correct

   

• Both (A) and (R) are correct and (R) is the correct explanation of (A)

   

Q 8 :    

Identify the correct set of reagents or reaction conditions 'X' and 'Y' in the following set of transformation.                 [2024]

• X = dil. aq. NaOH, 20°C, Y = ${\mathrm{Br}}_2/{\mathrm{CHCl}}_3$

   

• X = conc. alc. NaOH, 80°C, Y = HBr/acetic acid

   

• X = dil. aq. NaOH, 20°C, Y = HBr/acetic acid

   

• X = conc. alc. NaOH, 80°C, Y = ${\mathrm{Br}}_2/{\mathrm{CHCl}}_3$

   

Q 9 :    

Product P is                                                                    [2024]

Q 10 :    

Identify the major product in the following reaction.                                     [2024]