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CHXI13:HYDROCARBONS

318232 Anhydrous ${AlCl}_{3}$ is used as a catalyst in the Friedel-Crafts reaction because it is

1 an electron-rich molecule

2 soluble in ether

3 ionisable to

{Al}^{3 +}

and

{Cl}^{-}

4 an electron-deficient molecule

Explanation:

Anhyd. ${AlCl}_{3}$ acts as a Lewis acid.

CHXI13:HYDROCARBONS

318233 Assertion :
In nitration, $H_{2} {SO}_{4}$ is used as nitronium ion producer.
Reason :
Benzene has multi center $π$ bonding.

1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.

2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.

3 Assertion is correct but Reason is incorrect.

4 Assertion is incorrect but Reason is correct.

Explanation:

Benzene has delocalised $3 π$ -bonds . In the process of nitration, $H_{2} {SO}_{4}$ (sulfuric acid) is utilized as the nitronium ion $({NO}_{2}^{+})$ producer. This reaction involves the combination of concentrated nitric acid $({HNO}_{3})$ with sulfuric acid $(H_{2} {SO}_{4})$ , resulting in the formation of nitronium ions and other species. The reaction proceeds as follows:
${HNO}_{3} + 2 H_{2} {SO}_{4} \to 2 {HSO}_{4}^{-} + H_{3} O^{+} + {NO}_{2}^{+}$
So, option (2) is correct.

CHXI13:HYDROCARBONS

318234 Benzene reacts with sulphuric acid to form benzenesulphonic acid, only when the sulphuric acid is

1 cold and dilute

2 hot and dilute

3 hot and concentrated

4 mixed with

{HNO}_{3}

CHXI13:HYDROCARBONS

318235 Decreasing order of reactivity toward electrophilic substitution for the following compounds is
supporting img

1 D

>

A

>

E

>

C

>

B

2 A

>

D

>

E

>

B

>

C

3 C

>

B

>

A

>

D

>

E

4 E

>

D

>

A

>

B

>

C

Explanation:

Correct decreasing order of reactivity towards electrophilic substitution for following compounds is
supporting img

In $- C H_{3}, - O C H_{3}$ & $C F_{3}, C H_{3}$ & $- O C H_{3}$ are electron donating groups .Hence they activate the benzene nucleus. The $- {CF}_{3}$ groups deactivates the benzene nucleus, so it shows lower rate of electrophilic substitution on benzene ring.

JEE - 2023

CHXI13:HYDROCARBONS

318232 Anhydrous ${AlCl}_{3}$ is used as a catalyst in the Friedel-Crafts reaction because it is

1 an electron-rich molecule

2 soluble in ether

3 ionisable to

{Al}^{3 +}

and

{Cl}^{-}

4 an electron-deficient molecule

Explanation:

Anhyd. ${AlCl}_{3}$ acts as a Lewis acid.

CHXI13:HYDROCARBONS

318233 Assertion :
In nitration, $H_{2} {SO}_{4}$ is used as nitronium ion producer.
Reason :
Benzene has multi center $π$ bonding.

1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.

2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.

3 Assertion is correct but Reason is incorrect.

4 Assertion is incorrect but Reason is correct.

Explanation:

Benzene has delocalised $3 π$ -bonds . In the process of nitration, $H_{2} {SO}_{4}$ (sulfuric acid) is utilized as the nitronium ion $({NO}_{2}^{+})$ producer. This reaction involves the combination of concentrated nitric acid $({HNO}_{3})$ with sulfuric acid $(H_{2} {SO}_{4})$ , resulting in the formation of nitronium ions and other species. The reaction proceeds as follows:
${HNO}_{3} + 2 H_{2} {SO}_{4} \to 2 {HSO}_{4}^{-} + H_{3} O^{+} + {NO}_{2}^{+}$
So, option (2) is correct.

CHXI13:HYDROCARBONS

318234 Benzene reacts with sulphuric acid to form benzenesulphonic acid, only when the sulphuric acid is

1 cold and dilute

2 hot and dilute

3 hot and concentrated

4 mixed with

{HNO}_{3}

CHXI13:HYDROCARBONS

318235 Decreasing order of reactivity toward electrophilic substitution for the following compounds is
supporting img

1 D

>

A

>

E

>

C

>

B

2 A

>

D

>

E

>

B

>

C

3 C

>

B

>

A

>

D

>

E

4 E

>

D

>

A

>

B

>

C

Explanation:

Correct decreasing order of reactivity towards electrophilic substitution for following compounds is
supporting img

In $- C H_{3}, - O C H_{3}$ & $C F_{3}, C H_{3}$ & $- O C H_{3}$ are electron donating groups .Hence they activate the benzene nucleus. The $- {CF}_{3}$ groups deactivates the benzene nucleus, so it shows lower rate of electrophilic substitution on benzene ring.

JEE - 2023

CHXI13:HYDROCARBONS

318232 Anhydrous ${AlCl}_{3}$ is used as a catalyst in the Friedel-Crafts reaction because it is

1 an electron-rich molecule

2 soluble in ether

3 ionisable to

{Al}^{3 +}

and

{Cl}^{-}

4 an electron-deficient molecule

Explanation:

Anhyd. ${AlCl}_{3}$ acts as a Lewis acid.

CHXI13:HYDROCARBONS

318233 Assertion :
In nitration, $H_{2} {SO}_{4}$ is used as nitronium ion producer.
Reason :
Benzene has multi center $π$ bonding.

1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.

2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.

3 Assertion is correct but Reason is incorrect.

4 Assertion is incorrect but Reason is correct.

Explanation:

Benzene has delocalised $3 π$ -bonds . In the process of nitration, $H_{2} {SO}_{4}$ (sulfuric acid) is utilized as the nitronium ion $({NO}_{2}^{+})$ producer. This reaction involves the combination of concentrated nitric acid $({HNO}_{3})$ with sulfuric acid $(H_{2} {SO}_{4})$ , resulting in the formation of nitronium ions and other species. The reaction proceeds as follows:
${HNO}_{3} + 2 H_{2} {SO}_{4} \to 2 {HSO}_{4}^{-} + H_{3} O^{+} + {NO}_{2}^{+}$
So, option (2) is correct.

CHXI13:HYDROCARBONS

318234 Benzene reacts with sulphuric acid to form benzenesulphonic acid, only when the sulphuric acid is

1 cold and dilute

2 hot and dilute

3 hot and concentrated

4 mixed with

{HNO}_{3}

CHXI13:HYDROCARBONS

318235 Decreasing order of reactivity toward electrophilic substitution for the following compounds is
supporting img

1 D

>

A

>

E

>

C

>

B

2 A

>

D

>

E

>

B

>

C

3 C

>

B

>

A

>

D

>

E

4 E

>

D

>

A

>

B

>

C

Explanation:

Correct decreasing order of reactivity towards electrophilic substitution for following compounds is
supporting img

In $- C H_{3}, - O C H_{3}$ & $C F_{3}, C H_{3}$ & $- O C H_{3}$ are electron donating groups .Hence they activate the benzene nucleus. The $- {CF}_{3}$ groups deactivates the benzene nucleus, so it shows lower rate of electrophilic substitution on benzene ring.

JEE - 2023

CHXI13:HYDROCARBONS

318232 Anhydrous ${AlCl}_{3}$ is used as a catalyst in the Friedel-Crafts reaction because it is

1 an electron-rich molecule

2 soluble in ether

3 ionisable to

{Al}^{3 +}

and

{Cl}^{-}

4 an electron-deficient molecule

Explanation:

Anhyd. ${AlCl}_{3}$ acts as a Lewis acid.

CHXI13:HYDROCARBONS

318233 Assertion :
In nitration, $H_{2} {SO}_{4}$ is used as nitronium ion producer.
Reason :
Benzene has multi center $π$ bonding.

1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.

2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.

3 Assertion is correct but Reason is incorrect.

4 Assertion is incorrect but Reason is correct.

Explanation:

Benzene has delocalised $3 π$ -bonds . In the process of nitration, $H_{2} {SO}_{4}$ (sulfuric acid) is utilized as the nitronium ion $({NO}_{2}^{+})$ producer. This reaction involves the combination of concentrated nitric acid $({HNO}_{3})$ with sulfuric acid $(H_{2} {SO}_{4})$ , resulting in the formation of nitronium ions and other species. The reaction proceeds as follows:
${HNO}_{3} + 2 H_{2} {SO}_{4} \to 2 {HSO}_{4}^{-} + H_{3} O^{+} + {NO}_{2}^{+}$
So, option (2) is correct.

CHXI13:HYDROCARBONS

318234 Benzene reacts with sulphuric acid to form benzenesulphonic acid, only when the sulphuric acid is

1 cold and dilute

2 hot and dilute

3 hot and concentrated

4 mixed with

{HNO}_{3}

CHXI13:HYDROCARBONS

318235 Decreasing order of reactivity toward electrophilic substitution for the following compounds is
supporting img

1 D

>

A

>

E

>

C

>

B

2 A

>

D

>

E

>

B

>

C

3 C

>

B

>

A

>

D

>

E

4 E

>

D

>

A

>

B

>

C

Explanation:

Correct decreasing order of reactivity towards electrophilic substitution for following compounds is
supporting img

In $- C H_{3}, - O C H_{3}$ & $C F_{3}, C H_{3}$ & $- O C H_{3}$ are electron donating groups .Hence they activate the benzene nucleus. The $- {CF}_{3}$ groups deactivates the benzene nucleus, so it shows lower rate of electrophilic substitution on benzene ring.

JEE - 2023

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