Q 21 :

The products A and B in the following reactions, respectively, are:              [2025]

$A\stackrel{\mathit{Ag}\mathit{-}{\mathit{NO}}_{\mathit{2}}}{\mathit{\to }}{\text{CH}}_3-{\text{CH}}_2-{\text{CH}}_2-\text{Br}\stackrel{\mathrm{AgCN}}{\to }B$

• ${\text{CH}}_3{\text{CH}}_2{\text{CH}}_2{\text{NO}}_2,{\text{CH}}_3{\text{CH}}_2{\text{CH}}_2\text{CN}$

   

• ${\text{CH}}_3{\text{CH}}_2{\text{CH}}_2\text{ONO},{\text{CH}}_3{\text{CH}}_2{\text{CH}}_2\text{NC}$

   

• ${\text{CH}}_3{\text{CH}}_2{\text{CH}}_2\text{ONO},{\text{CH}}_3{\text{CH}}_2{\text{CH}}_2\text{CN}$

   

• ${\text{CH}}_3{\text{CH}}_2{\text{CH}}_2{\text{NO}}_2,{\text{CH}}_3{\text{CH}}_2{\text{CH}}_2\text{NC}$

   

Q 22 :

The product B formed in the following reaction sequence is:            [2025]

Q 23 :

The major product of the following reaction is:                      [2025]

• 2-Phenylhepta-2,4-diene

   

• 6-Phenylhepta-2,4-diene

   

• 2-Phenylhepta-2,5-diene

   

• 6-Phenylhepta-3,5-diene

   

Q 24 :

In the following substitution reaction:              [2025]

Product ‘P’ formed is:

Q 25 :

Given below are two statements:                               [2025]

Statement (I): Alcohols are formed when alkyl chlorides are treated with aqueous potassium hydroxide by elimination reaction.

Statement (II): In alcoholic potassium hydroxide, alkyl chlorides form alkenes by abstracting the hydrogen from the $\mathrm{\beta }$-carbon.

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

• Both Statement I and Statement II are incorrect

   

• Statement I is incorrect but Statement II is correct

   

• Statement I is correct but Statement II is incorrect

   

• Both Statement I and Statement II are correct

   

Q 26 :

For the reaction

${\mathrm{RCH}}_2\mathrm{Br}+{\mathrm{I}}^{-}\stackrel{\text{Acetone}}{\to }\underset{\text{Major}}{{\mathrm{RCH}}_2\mathrm{I}}+{\mathrm{Br}}^{-}$

The correct statement is                      [2023]

• The transition state formed in the above reaction is less polar than the localised anion.

   

• The reaction can occur in acetic acid also.

   

• ${\mathrm{Br}}^{-}$ can act as competing nucleophile.

   

• The solvent used in the reaction solvates the ions formed in the rate-determining step.

   

Q 27 :

Choose the halogen which is most reactive towards ${\mathrm{S}}_{\mathrm{N}}1$ reaction in the given compounds (A, B, C and D)             [2023]

• $\mathrm{A}-{\mathrm{Br}}_{\left(\mathrm{a}\right)}; \mathrm{B}-{\mathrm{I}}_{\left(\mathrm{a}\right)}; \mathrm{C}-{\mathrm{Br}}_{\left(\mathrm{b}\right)}; \mathrm{D}-{\mathrm{Br}}_{\left(\mathrm{a}\right)}$

   

• $\mathrm{A}-{\mathrm{Br}}_{\left(\mathrm{b}\right)}; \mathrm{B}-{\mathrm{I}}_{\left(\mathrm{a}\right)}; \mathrm{C}-{\mathrm{Br}}_{\left(\mathrm{a}\right)}; \mathrm{D}-{\mathrm{Br}}_{\left(\mathrm{a}\right)}$

   

• $\mathrm{A}-{\mathrm{Br}}_{\left(\mathrm{b}\right)}; \mathrm{B}-{\mathrm{I}}_{\left(\mathrm{b}\right)}; \mathrm{C}-{\mathrm{Br}}_{\left(\mathrm{b}\right)}; \mathrm{D}-{\mathrm{Br}}_{\left(\mathrm{b}\right)}$

   

• $\mathrm{A}-{\mathrm{Br}}_{\left(\mathrm{a}\right)}; \mathrm{B}-{\mathrm{I}}_{\left(\mathrm{a}\right)}; \mathrm{C}-{\mathrm{Br}}_{\left(\mathrm{a}\right)}; \mathrm{D}-{\mathrm{Br}}_{\left(\mathrm{a}\right)}$

   

Q 28 :

Identify the correct order of reactivity for the following pairs towards the respective mechanism.           [2023]

Choose the correct answer from the options given below:

• (A), (B) and (D) only

   

• (A), (B), (C) and (D)

   

• (B), (C) and (D) only

   

• (A), (C) and (D) only

   

Q 29 :

Compound from the following that will not produce precipitate on reaction with ${\mathrm{AgNO}}_3$ is:               [2023]

Q 30 :

2-Methyl propyl bromide reacts with ${\mathrm{C}}_2{\mathrm{H}}_5{\mathrm{O}}^{-}$ and gives 'A' whereas on reaction with ${\mathrm{C}}_2{\mathrm{H}}_5\mathrm{OH}$ it gives 'B'. The mechanism followed in these reactions and the products 'A' and 'B' respectively are:                         [2023]
 

• ${\mathrm{S}}_{\mathrm{N}}2,\mathrm{A}=2-\text{butyl ethyl ether};{\mathrm{S}}_{\mathrm{N}}2,\text{B=iso-butyl ethyl ether}$

   

• ${\mathrm{S}}_{\mathrm{N}}2,\mathrm{A}=\mathrm{iso}-\text{butyl ethyl ether};{\mathrm{S}}_{\mathrm{N}}1,\mathrm{B}=\mathrm{tert}-\text{butyl ethyl ether}$

   

• ${\text{S}}_{\mathrm{N}}1,\mathrm{A}=\mathrm{tert}-\text{butyl ethyl ether};{\mathrm{S}}_{\mathrm{N}}2,\mathrm{B}=\mathrm{iso}-\text{butyl ethyl ether}$

   

• ${\mathrm{S}}_{\mathrm{N}}1,\mathrm{A}=\mathrm{tert}-\text{butyl ethyl ether};{\mathrm{S}}_{\mathrm{N}}1,\mathrm{B}=2-\text{butyl ethyl ether}$