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CHXI12:ORGANIC CHEMISTRY SOME BASIC PRINCIPLES AND TECHNIQUES

317804 Assertion :
Rate of hydrolysis of methyl chloride to methanol is higher in DMF than in water.
Reason :
Hydrolysis of methyl chloride follows second order kinetics.

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:

Primary alkyl halides (here ${CH}_{3} Cl$ ) undergo $S_{N} 2$ reaction. It is a second order reaction.
$Rate α [RX] [{Nu}^{-}]$
Hence, hydrolysis of ${CH}_{3} Cl$ is favoured by non - polar medium or polar non - protic solvent (in which proton is not generated) like DMF.
$S_{N} 1$ reactions are favoured by polar solvents like water.

AIIMS - 2005

CHXI12:ORGANIC CHEMISTRY SOME BASIC PRINCIPLES AND TECHNIQUES

317805 The product of which of the following reactions has the highest ease to undergo electrophilic substitution?

1

C_{6} H_{5} COCl \overset{Pd/BaS O_{4}}{\to}

2

C_{6} H_{6} \overset{C l_{2} /FeC l_{3}}{\to}

3

C_{6} H_{6} \overset{C H_{3} Cl/Anhy .AlC l_{3}}{\to}

4

C_{6} H_{5} OH \overset{Conc . H_{2} S O_{4}}{\to}

Explanation:

Product of reaction given in option (3) is toluene
supporting img
$- {CH}_{3}$ group present in toluene, activates the benzene nucleus towards electrophilic substitution due to its ' + I' effect and hyper conjugation.

AIIMS - 2009

CHXI12:ORGANIC CHEMISTRY SOME BASIC PRINCIPLES AND TECHNIQUES

317806 Given
supporting img
In the above compounds correct order of reactivity in electrophilic substitution reactions (E. S. R). will be:

1 B

>

A

>

C

>

D

2 D

>

C

>

B

>

A

3 A

>

B

>

C

>

D

4 B

>

C

>

A

>

D

Explanation:

$R a t e o f E S R \propto E D G$
$\propto \frac{1}{E W G}$

JEE - 2013

CHXI12:ORGANIC CHEMISTRY SOME BASIC PRINCIPLES AND TECHNIQUES

317807 Substitution reactions may be

1 Free radical substitution

2 Nucleophilic substitution

3 Electrophilic substitution

4 All are correct

CHXI12:ORGANIC CHEMISTRY SOME BASIC PRINCIPLES AND TECHNIQUES

317808 Which of the following does not show $S_{N} 2$ reaction?

1 Vinylic halide,

> C = CH - X

2 Allyl chloride,

{CH}_{2} = {CHCH}_{2} Cl

3 Chlorobenzene

4 All of the above

Explanation:

Allyl chloride forms very stable allyl carbocation.
${CH}_{2} = CH - \overset{+}{C} H_{2}$ and rest two also have partial double bond character in their $C - X$ bond. Thus, all the given compounds do not undergo $S_{N} 2$ reaction.

AIIMS - 2012

CHXI12:ORGANIC CHEMISTRY SOME BASIC PRINCIPLES AND TECHNIQUES

317804 Assertion :
Rate of hydrolysis of methyl chloride to methanol is higher in DMF than in water.
Reason :
Hydrolysis of methyl chloride follows second order kinetics.

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:

Primary alkyl halides (here ${CH}_{3} Cl$ ) undergo $S_{N} 2$ reaction. It is a second order reaction.
$Rate α [RX] [{Nu}^{-}]$
Hence, hydrolysis of ${CH}_{3} Cl$ is favoured by non - polar medium or polar non - protic solvent (in which proton is not generated) like DMF.
$S_{N} 1$ reactions are favoured by polar solvents like water.

AIIMS - 2005

CHXI12:ORGANIC CHEMISTRY SOME BASIC PRINCIPLES AND TECHNIQUES

317805 The product of which of the following reactions has the highest ease to undergo electrophilic substitution?

1

C_{6} H_{5} COCl \overset{Pd/BaS O_{4}}{\to}

2

C_{6} H_{6} \overset{C l_{2} /FeC l_{3}}{\to}

3

C_{6} H_{6} \overset{C H_{3} Cl/Anhy .AlC l_{3}}{\to}

4

C_{6} H_{5} OH \overset{Conc . H_{2} S O_{4}}{\to}

Explanation:

Product of reaction given in option (3) is toluene
supporting img
$- {CH}_{3}$ group present in toluene, activates the benzene nucleus towards electrophilic substitution due to its ' + I' effect and hyper conjugation.

AIIMS - 2009

CHXI12:ORGANIC CHEMISTRY SOME BASIC PRINCIPLES AND TECHNIQUES

317806 Given
supporting img
In the above compounds correct order of reactivity in electrophilic substitution reactions (E. S. R). will be:

1 B

>

A

>

C

>

D

2 D

>

C

>

B

>

A

3 A

>

B

>

C

>

D

4 B

>

C

>

A

>

D

Explanation:

$R a t e o f E S R \propto E D G$
$\propto \frac{1}{E W G}$

JEE - 2013

CHXI12:ORGANIC CHEMISTRY SOME BASIC PRINCIPLES AND TECHNIQUES

317807 Substitution reactions may be

1 Free radical substitution

2 Nucleophilic substitution

3 Electrophilic substitution

4 All are correct

CHXI12:ORGANIC CHEMISTRY SOME BASIC PRINCIPLES AND TECHNIQUES

317808 Which of the following does not show $S_{N} 2$ reaction?

1 Vinylic halide,

> C = CH - X

2 Allyl chloride,

{CH}_{2} = {CHCH}_{2} Cl

3 Chlorobenzene

4 All of the above

Explanation:

Allyl chloride forms very stable allyl carbocation.
${CH}_{2} = CH - \overset{+}{C} H_{2}$ and rest two also have partial double bond character in their $C - X$ bond. Thus, all the given compounds do not undergo $S_{N} 2$ reaction.

AIIMS - 2012

CHXI12:ORGANIC CHEMISTRY SOME BASIC PRINCIPLES AND TECHNIQUES

317804 Assertion :
Rate of hydrolysis of methyl chloride to methanol is higher in DMF than in water.
Reason :
Hydrolysis of methyl chloride follows second order kinetics.

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:

Primary alkyl halides (here ${CH}_{3} Cl$ ) undergo $S_{N} 2$ reaction. It is a second order reaction.
$Rate α [RX] [{Nu}^{-}]$
Hence, hydrolysis of ${CH}_{3} Cl$ is favoured by non - polar medium or polar non - protic solvent (in which proton is not generated) like DMF.
$S_{N} 1$ reactions are favoured by polar solvents like water.

AIIMS - 2005

CHXI12:ORGANIC CHEMISTRY SOME BASIC PRINCIPLES AND TECHNIQUES

317805 The product of which of the following reactions has the highest ease to undergo electrophilic substitution?

1

C_{6} H_{5} COCl \overset{Pd/BaS O_{4}}{\to}

2

C_{6} H_{6} \overset{C l_{2} /FeC l_{3}}{\to}

3

C_{6} H_{6} \overset{C H_{3} Cl/Anhy .AlC l_{3}}{\to}

4

C_{6} H_{5} OH \overset{Conc . H_{2} S O_{4}}{\to}

Explanation:

Product of reaction given in option (3) is toluene
supporting img
$- {CH}_{3}$ group present in toluene, activates the benzene nucleus towards electrophilic substitution due to its ' + I' effect and hyper conjugation.

AIIMS - 2009

CHXI12:ORGANIC CHEMISTRY SOME BASIC PRINCIPLES AND TECHNIQUES

317806 Given
supporting img
In the above compounds correct order of reactivity in electrophilic substitution reactions (E. S. R). will be:

1 B

>

A

>

C

>

D

2 D

>

C

>

B

>

A

3 A

>

B

>

C

>

D

4 B

>

C

>

A

>

D

Explanation:

$R a t e o f E S R \propto E D G$
$\propto \frac{1}{E W G}$

JEE - 2013

CHXI12:ORGANIC CHEMISTRY SOME BASIC PRINCIPLES AND TECHNIQUES

317807 Substitution reactions may be

1 Free radical substitution

2 Nucleophilic substitution

3 Electrophilic substitution

4 All are correct

CHXI12:ORGANIC CHEMISTRY SOME BASIC PRINCIPLES AND TECHNIQUES

317808 Which of the following does not show $S_{N} 2$ reaction?

1 Vinylic halide,

> C = CH - X

2 Allyl chloride,

{CH}_{2} = {CHCH}_{2} Cl

3 Chlorobenzene

4 All of the above

Explanation:

Allyl chloride forms very stable allyl carbocation.
${CH}_{2} = CH - \overset{+}{C} H_{2}$ and rest two also have partial double bond character in their $C - X$ bond. Thus, all the given compounds do not undergo $S_{N} 2$ reaction.

AIIMS - 2012

CHXI12:ORGANIC CHEMISTRY SOME BASIC PRINCIPLES AND TECHNIQUES

317804 Assertion :
Rate of hydrolysis of methyl chloride to methanol is higher in DMF than in water.
Reason :
Hydrolysis of methyl chloride follows second order kinetics.

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:

Primary alkyl halides (here ${CH}_{3} Cl$ ) undergo $S_{N} 2$ reaction. It is a second order reaction.
$Rate α [RX] [{Nu}^{-}]$
Hence, hydrolysis of ${CH}_{3} Cl$ is favoured by non - polar medium or polar non - protic solvent (in which proton is not generated) like DMF.
$S_{N} 1$ reactions are favoured by polar solvents like water.

AIIMS - 2005

CHXI12:ORGANIC CHEMISTRY SOME BASIC PRINCIPLES AND TECHNIQUES

317805 The product of which of the following reactions has the highest ease to undergo electrophilic substitution?

1

C_{6} H_{5} COCl \overset{Pd/BaS O_{4}}{\to}

2

C_{6} H_{6} \overset{C l_{2} /FeC l_{3}}{\to}

3

C_{6} H_{6} \overset{C H_{3} Cl/Anhy .AlC l_{3}}{\to}

4

C_{6} H_{5} OH \overset{Conc . H_{2} S O_{4}}{\to}

Explanation:

Product of reaction given in option (3) is toluene
supporting img
$- {CH}_{3}$ group present in toluene, activates the benzene nucleus towards electrophilic substitution due to its ' + I' effect and hyper conjugation.

AIIMS - 2009

CHXI12:ORGANIC CHEMISTRY SOME BASIC PRINCIPLES AND TECHNIQUES

317806 Given
supporting img
In the above compounds correct order of reactivity in electrophilic substitution reactions (E. S. R). will be:

1 B

>

A

>

C

>

D

2 D

>

C

>

B

>

A

3 A

>

B

>

C

>

D

4 B

>

C

>

A

>

D

Explanation:

$R a t e o f E S R \propto E D G$
$\propto \frac{1}{E W G}$

JEE - 2013

CHXI12:ORGANIC CHEMISTRY SOME BASIC PRINCIPLES AND TECHNIQUES

317807 Substitution reactions may be

1 Free radical substitution

2 Nucleophilic substitution

3 Electrophilic substitution

4 All are correct

CHXI12:ORGANIC CHEMISTRY SOME BASIC PRINCIPLES AND TECHNIQUES

317808 Which of the following does not show $S_{N} 2$ reaction?

1 Vinylic halide,

> C = CH - X

2 Allyl chloride,

{CH}_{2} = {CHCH}_{2} Cl

3 Chlorobenzene

4 All of the above

Explanation:

Allyl chloride forms very stable allyl carbocation.
${CH}_{2} = CH - \overset{+}{C} H_{2}$ and rest two also have partial double bond character in their $C - X$ bond. Thus, all the given compounds do not undergo $S_{N} 2$ reaction.

AIIMS - 2012

CHXI12:ORGANIC CHEMISTRY SOME BASIC PRINCIPLES AND TECHNIQUES

317804 Assertion :
Rate of hydrolysis of methyl chloride to methanol is higher in DMF than in water.
Reason :
Hydrolysis of methyl chloride follows second order kinetics.

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:

Primary alkyl halides (here ${CH}_{3} Cl$ ) undergo $S_{N} 2$ reaction. It is a second order reaction.
$Rate α [RX] [{Nu}^{-}]$
Hence, hydrolysis of ${CH}_{3} Cl$ is favoured by non - polar medium or polar non - protic solvent (in which proton is not generated) like DMF.
$S_{N} 1$ reactions are favoured by polar solvents like water.

AIIMS - 2005

CHXI12:ORGANIC CHEMISTRY SOME BASIC PRINCIPLES AND TECHNIQUES

317805 The product of which of the following reactions has the highest ease to undergo electrophilic substitution?

1

C_{6} H_{5} COCl \overset{Pd/BaS O_{4}}{\to}

2

C_{6} H_{6} \overset{C l_{2} /FeC l_{3}}{\to}

3

C_{6} H_{6} \overset{C H_{3} Cl/Anhy .AlC l_{3}}{\to}

4

C_{6} H_{5} OH \overset{Conc . H_{2} S O_{4}}{\to}

Explanation:

Product of reaction given in option (3) is toluene
supporting img
$- {CH}_{3}$ group present in toluene, activates the benzene nucleus towards electrophilic substitution due to its ' + I' effect and hyper conjugation.

AIIMS - 2009

CHXI12:ORGANIC CHEMISTRY SOME BASIC PRINCIPLES AND TECHNIQUES

317806 Given
supporting img
In the above compounds correct order of reactivity in electrophilic substitution reactions (E. S. R). will be:

1 B

>

A

>

C

>

D

2 D

>

C

>

B

>

A

3 A

>

B

>

C

>

D

4 B

>

C

>

A

>

D

Explanation:

$R a t e o f E S R \propto E D G$
$\propto \frac{1}{E W G}$

JEE - 2013

CHXI12:ORGANIC CHEMISTRY SOME BASIC PRINCIPLES AND TECHNIQUES

317807 Substitution reactions may be

1 Free radical substitution

2 Nucleophilic substitution

3 Electrophilic substitution

4 All are correct

CHXI12:ORGANIC CHEMISTRY SOME BASIC PRINCIPLES AND TECHNIQUES

317808 Which of the following does not show $S_{N} 2$ reaction?

1 Vinylic halide,

> C = CH - X

2 Allyl chloride,

{CH}_{2} = {CHCH}_{2} Cl

3 Chlorobenzene

4 All of the above

Explanation:

Allyl chloride forms very stable allyl carbocation.
${CH}_{2} = CH - \overset{+}{C} H_{2}$ and rest two also have partial double bond character in their $C - X$ bond. Thus, all the given compounds do not undergo $S_{N} 2$ reaction.

AIIMS - 2012