QBManager

AMINES

278792 Question Image A. The Compound A (major product) is

1

2

3

4

Explanation:

Exp: 4-ethylnitrobenzene reacts with ${Br}_{2}$ in presence of UV light then the free radical halogenation reaction takes place in benzylic carbon of the compound.
Question Image

Kerala-CEE-29.08.2021

AMINES

278796 Question Image
In the above chemical reaction, intermediate $X$ and reagent/condition $A$ are

1

2

3

4

JEE Main 2021

AMINES

278797 JEE Main 2021 (Online) 18th March Morning Shift Chemistry - Compounds Containing Nitrogen Question 123 English

1

JEE Main 2021 (Online) 18th March Morning Shift Chemistry - Compounds Containing Nitrogen Question 123 English Option 1

2

JEE Main 2021 (Online) 18th March Morning Shift Chemistry - Compounds Containing Nitrogen Question 123 English Option 2

3

JEE Main 2021 (Online) 18th March Morning Shift Chemistry - Compounds Containing Nitrogen Question 123 English Option 3

4

JEE Main 2021 (Online) 18th March Morning Shift Chemistry - Compounds Containing Nitrogen Question 123 English Option 4

Explanation:

JEE Main 2021 (Online) 18th March Morning Shift Chemistry - Compounds Containing Nitrogen Question 123 English Explanation
Benzene diazonium chloride reacts with $N, N$ dimethylaniline and show coupling reactions.

JEE Main 2021

AMINES

278802 The increasing order of ${pK}_{b}$ values of the following compounds is

1 II

<

IV

<

III

<

I

2 I

<

II

<

IV

<

III

3 II

<

I

<

III

<

IV

4 I

<

II

<

III

<

IV

Explanation:

${pK}_{b} \propto \frac{1}{Basic strength}$
Basic strength $\propto \frac{+ M | + H | + I}{- M | - H | - I}$
original image

In case of (I) $- {OCH}_{3}$ group is $O$ and $P$ directing so it increases the basicity while in case of (IV) $- OH$ group is also $O$ and $P$ directing but $- OH$ does not increases the electron density on $- N {({CH}_{3})}_{2}$ . So, its basicity is less. In case of (III) - $CN$ group is m-directing so it decrease the electron density on $- N {({CH}_{3})}_{2}$ Hence, its basicity is less.
Order of ${pK}_{b}$ value:- (I) $<$ (II) $<$ (IV) $<$ (III)

JEE Main 2020

AMINES

278792 Question Image A. The Compound A (major product) is

1

2

3

4

Explanation:

Exp: 4-ethylnitrobenzene reacts with ${Br}_{2}$ in presence of UV light then the free radical halogenation reaction takes place in benzylic carbon of the compound.
Question Image

Kerala-CEE-29.08.2021

AMINES

278796 Question Image
In the above chemical reaction, intermediate $X$ and reagent/condition $A$ are

1

2

3

4

JEE Main 2021

AMINES

278797 JEE Main 2021 (Online) 18th March Morning Shift Chemistry - Compounds Containing Nitrogen Question 123 English

1

2

3

4

Explanation:

JEE Main 2021 (Online) 18th March Morning Shift Chemistry - Compounds Containing Nitrogen Question 123 English Explanation
Benzene diazonium chloride reacts with $N, N$ dimethylaniline and show coupling reactions.

JEE Main 2021

AMINES

278802 The increasing order of ${pK}_{b}$ values of the following compounds is

1 II

<

IV

<

III

<

I

2 I

<

II

<

IV

<

III

3 II

<

I

<

III

<

IV

4 I

<

II

<

III

<

IV

Explanation:

${pK}_{b} \propto \frac{1}{Basic strength}$
Basic strength $\propto \frac{+ M | + H | + I}{- M | - H | - I}$
original image

In case of (I) $- {OCH}_{3}$ group is $O$ and $P$ directing so it increases the basicity while in case of (IV) $- OH$ group is also $O$ and $P$ directing but $- OH$ does not increases the electron density on $- N {({CH}_{3})}_{2}$ . So, its basicity is less. In case of (III) - $CN$ group is m-directing so it decrease the electron density on $- N {({CH}_{3})}_{2}$ Hence, its basicity is less.
Order of ${pK}_{b}$ value:- (I) $<$ (II) $<$ (IV) $<$ (III)

JEE Main 2020

AMINES

278792 Question Image A. The Compound A (major product) is

1

2

3

4

Explanation:

Exp: 4-ethylnitrobenzene reacts with ${Br}_{2}$ in presence of UV light then the free radical halogenation reaction takes place in benzylic carbon of the compound.
Question Image

Kerala-CEE-29.08.2021

AMINES

278796 Question Image
In the above chemical reaction, intermediate $X$ and reagent/condition $A$ are

1

2

3

4

JEE Main 2021

AMINES

278797 JEE Main 2021 (Online) 18th March Morning Shift Chemistry - Compounds Containing Nitrogen Question 123 English

1

2

3

4

Explanation:

JEE Main 2021 (Online) 18th March Morning Shift Chemistry - Compounds Containing Nitrogen Question 123 English Explanation
Benzene diazonium chloride reacts with $N, N$ dimethylaniline and show coupling reactions.

JEE Main 2021

AMINES

278802 The increasing order of ${pK}_{b}$ values of the following compounds is

1 II

<

IV

<

III

<

I

2 I

<

II

<

IV

<

III

3 II

<

I

<

III

<

IV

4 I

<

II

<

III

<

IV

Explanation:

${pK}_{b} \propto \frac{1}{Basic strength}$
Basic strength $\propto \frac{+ M | + H | + I}{- M | - H | - I}$
original image

In case of (I) $- {OCH}_{3}$ group is $O$ and $P$ directing so it increases the basicity while in case of (IV) $- OH$ group is also $O$ and $P$ directing but $- OH$ does not increases the electron density on $- N {({CH}_{3})}_{2}$ . So, its basicity is less. In case of (III) - $CN$ group is m-directing so it decrease the electron density on $- N {({CH}_{3})}_{2}$ Hence, its basicity is less.
Order of ${pK}_{b}$ value:- (I) $<$ (II) $<$ (IV) $<$ (III)

JEE Main 2020

AMINES

278792 Question Image A. The Compound A (major product) is

1

2

3

4

Explanation:

Exp: 4-ethylnitrobenzene reacts with ${Br}_{2}$ in presence of UV light then the free radical halogenation reaction takes place in benzylic carbon of the compound.
Question Image

Kerala-CEE-29.08.2021

AMINES

278796 Question Image
In the above chemical reaction, intermediate $X$ and reagent/condition $A$ are

1

2

3

4

JEE Main 2021

AMINES

278797 JEE Main 2021 (Online) 18th March Morning Shift Chemistry - Compounds Containing Nitrogen Question 123 English

1

2

3

4

Explanation:

JEE Main 2021 (Online) 18th March Morning Shift Chemistry - Compounds Containing Nitrogen Question 123 English Explanation
Benzene diazonium chloride reacts with $N, N$ dimethylaniline and show coupling reactions.

JEE Main 2021

AMINES

278802 The increasing order of ${pK}_{b}$ values of the following compounds is

1 II

<

IV

<

III

<

I

2 I

<

II

<

IV

<

III

3 II

<

I

<

III

<

IV

4 I

<

II

<

III

<

IV

Explanation:

${pK}_{b} \propto \frac{1}{Basic strength}$
Basic strength $\propto \frac{+ M | + H | + I}{- M | - H | - I}$
original image

In case of (I) $- {OCH}_{3}$ group is $O$ and $P$ directing so it increases the basicity while in case of (IV) $- OH$ group is also $O$ and $P$ directing but $- OH$ does not increases the electron density on $- N {({CH}_{3})}_{2}$ . So, its basicity is less. In case of (III) - $CN$ group is m-directing so it decrease the electron density on $- N {({CH}_{3})}_{2}$ Hence, its basicity is less.
Order of ${pK}_{b}$ value:- (I) $<$ (II) $<$ (IV) $<$ (III)

JEE Main 2020