QBManager

CHXI12:ORGANIC CHEMISTRY SOME BASIC PRINCIPLES AND TECHNIQUES

317419 Give the stability order the following:
supporting img

1 S

>

R

>

Q

>

P

2 P

>

Q

>

R

>

S

3 Q

>

P

>

R

>

S

4

P > Q > S > R

Explanation:

Benzyl Carbanion stability $α - M, - I$ groups at $O / P$ positions.
$- {NO}_{2} - CN$ are $- M$ groups and $- {CH}_{3}$ is $+ I$ group.

CHXI12:ORGANIC CHEMISTRY SOME BASIC PRINCIPLES AND TECHNIQUES

317420 The three carbanions follow which order of stability?
supporting img

1 I

>

II

>

III

2 I

>

III

>

II

3 II

>

I

>

III

4 II

>

III

>

I

Explanation:

In o-nitrobenzyl carbanion; and p-nitrobenzyl carbanion, $- {NO}_{2}$ group shows both $- I$ and -R effect but $- I$ effect is stronger in o-nitrobenzyl carbanion hence, it is more stable.In m-nitrobenzyl carbanion there is only $- I$ -effect. Therefore, the stability order is
supporting img

CHXI12:ORGANIC CHEMISTRY SOME BASIC PRINCIPLES AND TECHNIQUES

317421 Correct order of stability of carbanion is
supporting img

1 (I)

>

(II)

>

(III)

>

(IV)

2 (IV)

>

(III)

>

(II)

>

(I)

3 (IV)

>

(I)

>

(III)

>

(II)

4 (III)

>

(II)

>

(IV)

>

(I)

Explanation:

(IV) is aromatic as it contains $6 π e$ 's and follows Huckel's rule. So it is most stable.
(I) is anti-aromatic. So it is least stable.
(III) is more stable than (II) due to greater ring size. So, the correct option is (2).

JEE Main - 2024

CHXI12:ORGANIC CHEMISTRY SOME BASIC PRINCIPLES AND TECHNIQUES

317422 The pair of electron in the given carbanion, ${CH}_{3} C \equiv C^{Θ}$ , is present in which of the following orbitals?

1

s p

2

2 p

3

s p^{3}

4

s p^{2}

Explanation:

supporting img
( $2 σ + 2 π$ , -ve charge is considered to be sigma)

NEET - 2016

CHXI12:ORGANIC CHEMISTRY SOME BASIC PRINCIPLES AND TECHNIQUES

317419 Give the stability order the following:
supporting img

1 S

>

R

>

Q

>

P

2 P

>

Q

>

R

>

S

3 Q

>

P

>

R

>

S

4

P > Q > S > R

Explanation:

Benzyl Carbanion stability $α - M, - I$ groups at $O / P$ positions.
$- {NO}_{2} - CN$ are $- M$ groups and $- {CH}_{3}$ is $+ I$ group.

CHXI12:ORGANIC CHEMISTRY SOME BASIC PRINCIPLES AND TECHNIQUES

317420 The three carbanions follow which order of stability?
supporting img

1 I

>

II

>

III

2 I

>

III

>

II

3 II

>

I

>

III

4 II

>

III

>

I

Explanation:

In o-nitrobenzyl carbanion; and p-nitrobenzyl carbanion, $- {NO}_{2}$ group shows both $- I$ and -R effect but $- I$ effect is stronger in o-nitrobenzyl carbanion hence, it is more stable.In m-nitrobenzyl carbanion there is only $- I$ -effect. Therefore, the stability order is
supporting img

CHXI12:ORGANIC CHEMISTRY SOME BASIC PRINCIPLES AND TECHNIQUES

317421 Correct order of stability of carbanion is
supporting img

1 (I)

>

(II)

>

(III)

>

(IV)

2 (IV)

>

(III)

>

(II)

>

(I)

3 (IV)

>

(I)

>

(III)

>

(II)

4 (III)

>

(II)

>

(IV)

>

(I)

Explanation:

(IV) is aromatic as it contains $6 π e$ 's and follows Huckel's rule. So it is most stable.
(I) is anti-aromatic. So it is least stable.
(III) is more stable than (II) due to greater ring size. So, the correct option is (2).

JEE Main - 2024

CHXI12:ORGANIC CHEMISTRY SOME BASIC PRINCIPLES AND TECHNIQUES

317422 The pair of electron in the given carbanion, ${CH}_{3} C \equiv C^{Θ}$ , is present in which of the following orbitals?

1

s p

2

2 p

3

s p^{3}

4

s p^{2}

Explanation:

supporting img
( $2 σ + 2 π$ , -ve charge is considered to be sigma)

NEET - 2016

CHXI12:ORGANIC CHEMISTRY SOME BASIC PRINCIPLES AND TECHNIQUES

317419 Give the stability order the following:
supporting img

1 S

>

R

>

Q

>

P

2 P

>

Q

>

R

>

S

3 Q

>

P

>

R

>

S

4

P > Q > S > R

Explanation:

Benzyl Carbanion stability $α - M, - I$ groups at $O / P$ positions.
$- {NO}_{2} - CN$ are $- M$ groups and $- {CH}_{3}$ is $+ I$ group.

CHXI12:ORGANIC CHEMISTRY SOME BASIC PRINCIPLES AND TECHNIQUES

317420 The three carbanions follow which order of stability?
supporting img

1 I

>

II

>

III

2 I

>

III

>

II

3 II

>

I

>

III

4 II

>

III

>

I

Explanation:

In o-nitrobenzyl carbanion; and p-nitrobenzyl carbanion, $- {NO}_{2}$ group shows both $- I$ and -R effect but $- I$ effect is stronger in o-nitrobenzyl carbanion hence, it is more stable.In m-nitrobenzyl carbanion there is only $- I$ -effect. Therefore, the stability order is
supporting img

CHXI12:ORGANIC CHEMISTRY SOME BASIC PRINCIPLES AND TECHNIQUES

317421 Correct order of stability of carbanion is
supporting img

1 (I)

>

(II)

>

(III)

>

(IV)

2 (IV)

>

(III)

>

(II)

>

(I)

3 (IV)

>

(I)

>

(III)

>

(II)

4 (III)

>

(II)

>

(IV)

>

(I)

Explanation:

(IV) is aromatic as it contains $6 π e$ 's and follows Huckel's rule. So it is most stable.
(I) is anti-aromatic. So it is least stable.
(III) is more stable than (II) due to greater ring size. So, the correct option is (2).

JEE Main - 2024

CHXI12:ORGANIC CHEMISTRY SOME BASIC PRINCIPLES AND TECHNIQUES

317422 The pair of electron in the given carbanion, ${CH}_{3} C \equiv C^{Θ}$ , is present in which of the following orbitals?

1

s p

2

2 p

3

s p^{3}

4

s p^{2}

Explanation:

supporting img
( $2 σ + 2 π$ , -ve charge is considered to be sigma)

NEET - 2016

CHXI12:ORGANIC CHEMISTRY SOME BASIC PRINCIPLES AND TECHNIQUES

317419 Give the stability order the following:
supporting img

1 S

>

R

>

Q

>

P

2 P

>

Q

>

R

>

S

3 Q

>

P

>

R

>

S

4

P > Q > S > R

Explanation:

Benzyl Carbanion stability $α - M, - I$ groups at $O / P$ positions.
$- {NO}_{2} - CN$ are $- M$ groups and $- {CH}_{3}$ is $+ I$ group.

CHXI12:ORGANIC CHEMISTRY SOME BASIC PRINCIPLES AND TECHNIQUES

317420 The three carbanions follow which order of stability?
supporting img

1 I

>

II

>

III

2 I

>

III

>

II

3 II

>

I

>

III

4 II

>

III

>

I

Explanation:

In o-nitrobenzyl carbanion; and p-nitrobenzyl carbanion, $- {NO}_{2}$ group shows both $- I$ and -R effect but $- I$ effect is stronger in o-nitrobenzyl carbanion hence, it is more stable.In m-nitrobenzyl carbanion there is only $- I$ -effect. Therefore, the stability order is
supporting img

CHXI12:ORGANIC CHEMISTRY SOME BASIC PRINCIPLES AND TECHNIQUES

317421 Correct order of stability of carbanion is
supporting img

1 (I)

>

(II)

>

(III)

>

(IV)

2 (IV)

>

(III)

>

(II)

>

(I)

3 (IV)

>

(I)

>

(III)

>

(II)

4 (III)

>

(II)

>

(IV)

>

(I)

Explanation:

(IV) is aromatic as it contains $6 π e$ 's and follows Huckel's rule. So it is most stable.
(I) is anti-aromatic. So it is least stable.
(III) is more stable than (II) due to greater ring size. So, the correct option is (2).

JEE Main - 2024

CHXI12:ORGANIC CHEMISTRY SOME BASIC PRINCIPLES AND TECHNIQUES

317422 The pair of electron in the given carbanion, ${CH}_{3} C \equiv C^{Θ}$ , is present in which of the following orbitals?

1

s p

2

2 p

3

s p^{3}

4

s p^{2}

Explanation:

supporting img
( $2 σ + 2 π$ , -ve charge is considered to be sigma)

NEET - 2016