QBManager

GENERAL ORGANIC CHEMISTRY

231321 The correct order of increasing acidic nature of the following compounds is
$Erroneous nesting of equation structures$

1 I

<

II

<

III

<

IV

2 II

<

I

<

III

<

IV

3 III

<

II

<

I

<

IV

4 I

<

III

<

II

<

IV

Explanation:

(B)

Since - I effect increase the acidity in phenolic group and $+ I$ effect decrease the acidity and no of group also effect.
Hence ${NO}_{2}$ and $Cl$ increase the acidity and ${CH}_{3}$ group decreases.
The picric acid have $3 {NO}_{2}$ group which increase acidity highly and then o-nitro and then o-chloro phenol and last is o-c resol.

AMU-2019

GENERAL ORGANIC CHEMISTRY

231322 The decreasing order of rate of $S_{N} 1$ reaction in the following compounds will be

1

3 > 2 > 1

2

1 > 2 > 3

3

1 > 3 > 2

4

2 > 3 > 1

Explanation:

In ${SN}^{1}$ reaction carbocation intermedia is form and those carbocation which is state, the rate of $R^{xh}$ is high for which

1.Carbocation is antiaromatic
2.Carbocation is aromatic
3.Carbocation is non aromative
Hence, the order of stability of carbocation
$2 > 3 > 1$
Hence the order of rate of $S_{N} 1$ reaction is
$2 > 3 > 1$

AMU-2019

GENERAL ORGANIC CHEMISTRY

231323 The correct decreasing order of acidic strength of
(A) trichloroacetic acid,(B) trifluoroacetic acid,
(C) acetic acid and (D) formic acid is

1 A

>

B

>

C

>

D

2 A

>

C

>

B

>

D

3 B

>

A

>

D

>

C

4 B

>

A

>

C

>

D

Explanation:

(C) :
$A - {CCl}_{3} COOH$
$B - {CF}_{3} COOH$
$C - {CH}_{3} COOH$
$D - HCOOH$
-I effect increase the acidity
$+ I$ effect decrease the acidity
And higher the electronegative group have higher
-I effect
Hence, the order of acidity is
$B > A > D > C$

AMU-2019

GENERAL ORGANIC CHEMISTRY

231324 Consider the following carbocations:

The decreasing order of stability of these carbocations will be

1

1 > 2 > 3 > 4

2

1 > 3 > 2 > 4

3

1 > 3 > 4 > 2

4

1 > 2 > 4 > 3

Explanation:

As we know that the order of stability of corbocation is $3^{\circ} > 2^{\circ} > 1^{\circ} >$ methyl
Hence, 1 is most stable and 4 is least stable.
In case of 2 and $310^{th}$ are $2^{\circ}$ carbocation but in 3 both side large group push electron and in 2 one side is large other side is small.
Hence, the decreasing order of stability is $1 > 3 > 2 > 4$

AMU-2019

GENERAL ORGANIC CHEMISTRY

231321 The correct order of increasing acidic nature of the following compounds is
$Erroneous nesting of equation structures$

1 I

<

II

<

III

<

IV

2 II

<

I

<

III

<

IV

3 III

<

II

<

I

<

IV

4 I

<

III

<

II

<

IV

Explanation:

(B)

Since - I effect increase the acidity in phenolic group and $+ I$ effect decrease the acidity and no of group also effect.
Hence ${NO}_{2}$ and $Cl$ increase the acidity and ${CH}_{3}$ group decreases.
The picric acid have $3 {NO}_{2}$ group which increase acidity highly and then o-nitro and then o-chloro phenol and last is o-c resol.

AMU-2019

GENERAL ORGANIC CHEMISTRY

231322 The decreasing order of rate of $S_{N} 1$ reaction in the following compounds will be

1

3 > 2 > 1

2

1 > 2 > 3

3

1 > 3 > 2

4

2 > 3 > 1

Explanation:

In ${SN}^{1}$ reaction carbocation intermedia is form and those carbocation which is state, the rate of $R^{xh}$ is high for which

1.Carbocation is antiaromatic
2.Carbocation is aromatic
3.Carbocation is non aromative
Hence, the order of stability of carbocation
$2 > 3 > 1$
Hence the order of rate of $S_{N} 1$ reaction is
$2 > 3 > 1$

AMU-2019

GENERAL ORGANIC CHEMISTRY

231323 The correct decreasing order of acidic strength of
(A) trichloroacetic acid,(B) trifluoroacetic acid,
(C) acetic acid and (D) formic acid is

1 A

>

B

>

C

>

D

2 A

>

C

>

B

>

D

3 B

>

A

>

D

>

C

4 B

>

A

>

C

>

D

Explanation:

(C) :
$A - {CCl}_{3} COOH$
$B - {CF}_{3} COOH$
$C - {CH}_{3} COOH$
$D - HCOOH$
-I effect increase the acidity
$+ I$ effect decrease the acidity
And higher the electronegative group have higher
-I effect
Hence, the order of acidity is
$B > A > D > C$

AMU-2019

GENERAL ORGANIC CHEMISTRY

231324 Consider the following carbocations:

The decreasing order of stability of these carbocations will be

1

1 > 2 > 3 > 4

2

1 > 3 > 2 > 4

3

1 > 3 > 4 > 2

4

1 > 2 > 4 > 3

Explanation:

As we know that the order of stability of corbocation is $3^{\circ} > 2^{\circ} > 1^{\circ} >$ methyl
Hence, 1 is most stable and 4 is least stable.
In case of 2 and $310^{th}$ are $2^{\circ}$ carbocation but in 3 both side large group push electron and in 2 one side is large other side is small.
Hence, the decreasing order of stability is $1 > 3 > 2 > 4$

AMU-2019

GENERAL ORGANIC CHEMISTRY

231321 The correct order of increasing acidic nature of the following compounds is
$Erroneous nesting of equation structures$

1 I

<

II

<

III

<

IV

2 II

<

I

<

III

<

IV

3 III

<

II

<

I

<

IV

4 I

<

III

<

II

<

IV

Explanation:

(B)

Since - I effect increase the acidity in phenolic group and $+ I$ effect decrease the acidity and no of group also effect.
Hence ${NO}_{2}$ and $Cl$ increase the acidity and ${CH}_{3}$ group decreases.
The picric acid have $3 {NO}_{2}$ group which increase acidity highly and then o-nitro and then o-chloro phenol and last is o-c resol.

AMU-2019

GENERAL ORGANIC CHEMISTRY

231322 The decreasing order of rate of $S_{N} 1$ reaction in the following compounds will be

1

3 > 2 > 1

2

1 > 2 > 3

3

1 > 3 > 2

4

2 > 3 > 1

Explanation:

In ${SN}^{1}$ reaction carbocation intermedia is form and those carbocation which is state, the rate of $R^{xh}$ is high for which

1.Carbocation is antiaromatic
2.Carbocation is aromatic
3.Carbocation is non aromative
Hence, the order of stability of carbocation
$2 > 3 > 1$
Hence the order of rate of $S_{N} 1$ reaction is
$2 > 3 > 1$

AMU-2019

GENERAL ORGANIC CHEMISTRY

231323 The correct decreasing order of acidic strength of
(A) trichloroacetic acid,(B) trifluoroacetic acid,
(C) acetic acid and (D) formic acid is

1 A

>

B

>

C

>

D

2 A

>

C

>

B

>

D

3 B

>

A

>

D

>

C

4 B

>

A

>

C

>

D

Explanation:

(C) :
$A - {CCl}_{3} COOH$
$B - {CF}_{3} COOH$
$C - {CH}_{3} COOH$
$D - HCOOH$
-I effect increase the acidity
$+ I$ effect decrease the acidity
And higher the electronegative group have higher
-I effect
Hence, the order of acidity is
$B > A > D > C$

AMU-2019

GENERAL ORGANIC CHEMISTRY

231324 Consider the following carbocations:

The decreasing order of stability of these carbocations will be

1

1 > 2 > 3 > 4

2

1 > 3 > 2 > 4

3

1 > 3 > 4 > 2

4

1 > 2 > 4 > 3

Explanation:

As we know that the order of stability of corbocation is $3^{\circ} > 2^{\circ} > 1^{\circ} >$ methyl
Hence, 1 is most stable and 4 is least stable.
In case of 2 and $310^{th}$ are $2^{\circ}$ carbocation but in 3 both side large group push electron and in 2 one side is large other side is small.
Hence, the decreasing order of stability is $1 > 3 > 2 > 4$

AMU-2019

GENERAL ORGANIC CHEMISTRY

231321 The correct order of increasing acidic nature of the following compounds is
$Erroneous nesting of equation structures$

1 I

<

II

<

III

<

IV

2 II

<

I

<

III

<

IV

3 III

<

II

<

I

<

IV

4 I

<

III

<

II

<

IV

Explanation:

(B)

Since - I effect increase the acidity in phenolic group and $+ I$ effect decrease the acidity and no of group also effect.
Hence ${NO}_{2}$ and $Cl$ increase the acidity and ${CH}_{3}$ group decreases.
The picric acid have $3 {NO}_{2}$ group which increase acidity highly and then o-nitro and then o-chloro phenol and last is o-c resol.

AMU-2019

GENERAL ORGANIC CHEMISTRY

231322 The decreasing order of rate of $S_{N} 1$ reaction in the following compounds will be

1

3 > 2 > 1

2

1 > 2 > 3

3

1 > 3 > 2

4

2 > 3 > 1

Explanation:

In ${SN}^{1}$ reaction carbocation intermedia is form and those carbocation which is state, the rate of $R^{xh}$ is high for which

1.Carbocation is antiaromatic
2.Carbocation is aromatic
3.Carbocation is non aromative
Hence, the order of stability of carbocation
$2 > 3 > 1$
Hence the order of rate of $S_{N} 1$ reaction is
$2 > 3 > 1$

AMU-2019

GENERAL ORGANIC CHEMISTRY

231323 The correct decreasing order of acidic strength of
(A) trichloroacetic acid,(B) trifluoroacetic acid,
(C) acetic acid and (D) formic acid is

1 A

>

B

>

C

>

D

2 A

>

C

>

B

>

D

3 B

>

A

>

D

>

C

4 B

>

A

>

C

>

D

Explanation:

(C) :
$A - {CCl}_{3} COOH$
$B - {CF}_{3} COOH$
$C - {CH}_{3} COOH$
$D - HCOOH$
-I effect increase the acidity
$+ I$ effect decrease the acidity
And higher the electronegative group have higher
-I effect
Hence, the order of acidity is
$B > A > D > C$

AMU-2019

GENERAL ORGANIC CHEMISTRY

231324 Consider the following carbocations:

The decreasing order of stability of these carbocations will be

1

1 > 2 > 3 > 4

2

1 > 3 > 2 > 4

3

1 > 3 > 4 > 2

4

1 > 2 > 4 > 3

Explanation:

As we know that the order of stability of corbocation is $3^{\circ} > 2^{\circ} > 1^{\circ} >$ methyl
Hence, 1 is most stable and 4 is least stable.
In case of 2 and $310^{th}$ are $2^{\circ}$ carbocation but in 3 both side large group push electron and in 2 one side is large other side is small.
Hence, the decreasing order of stability is $1 > 3 > 2 > 4$

AMU-2019