NEET Chemistry MCQ: NCERT Electron Displacements | NEET.Guide Questions

Which of the following statements is INCORRECT regarding the mesomeric effect?

A

It involves the delocalization of π electrons or lone pairs

B

It operates only in conjugated systems

C

It can be positive (+M/+R) or negative (-M/-R)

D

It is a temporary effect

Question Tags

📚 Subject:Chemistry

📑 Chapter:Organic Chemistry: Some basic principles and techniques

🎯Topic:Electron Displacements

🎓 Ncert Level:Understanding

🎯Difficulty :Hard

⚡ Time Required :1 mins

🔄Ncert Concepts :Mesomeric Effect, Resonance, Conjugation, Inductive Effect

Related Questions

Arrange the following carbocations in decreasing order of stability:

I. $(CH_3)_3C^+$

II. $(CH_3)_2CH^+$

III. $CH_3CH_2^+$

IV. $CH_3^+$

A

I > II > III > IV

B

II > I > IV > III

C

III > II > I > IV

D

IV > III > II > I

Question Tags

📚 Subject:Chemistry

📑 Chapter:Organic Chemistry: Some basic principles and techniques

🎯Topic:Electron Displacements

PYQ YEAR: 2020

🎓 Ncert Level:Application

🎯Difficulty :Easy

⚡ Time Required :1.5 mins

🔄Ncert Concepts :Organic Chemistry, Carbocations, Stability, Inductive Effect, Hyperconjugation

Which carbocation is least likely to undergo rearrangement?

A

$CH_3^+$

B

$CH_3CH_2^+$

C

$(CH_3)_2CH^+$

D

$(CH_3)_3C^+$

Question Tags

📚 Subject:Chemistry

📑 Chapter:Organic Chemistry: Some basic principles and techniques

🎯Topic:Electron Displacements

PYQ YEAR: 2024

🎓 Ncert Level:Application

🎯Difficulty :Medium

⚡ Time Required :1 mins

🔄Ncert Concepts :Organic Chemistry, Carbocations, Stability, Rearrangement

Among the following compounds nitrobenzene, benzene, aniline and phenol, the strongest basic behaviour in acid medium is exhibited by :

A

Phenol

B

Aniline

C

Nitrobenzene

D

Benzene

Question Tags

📚 Subject:Chemistry

📑 Chapter:Organic Chemistry: Some basic principles and techniques

🎯Topic:Electron Displacements

🎓 Ncert Level:Analyzing

🎯Difficulty :Easy

⚡ Time Required :2 mins

🔄Ncert Concepts :Basicity, Organic Chemistry, Resonance, Substituent Effects

Which of the following statements correctly describes the inductive effect ( $-I$ ) of substituents?

A

Electron-withdrawing groups like halogens exhibit a $-I$ effect.

B

Alkyl groups ( $-R$ ) exhibit a $-I$ effect.

C

The $+I$ effect increases with increasing electronegativity of the substituent.

D

The $-I$ effect is transmitted through pi bonds.

Question Tags

📚 Subject:Chemistry

📑 Chapter:Organic Chemistry: Some basic principles and techniques

🎯Topic:Electron Displacements

PYQ YEAR: 2018

🎓 Ncert Level:Understanding

🎯Difficulty :Easy

⚡ Time Required :1 mins

🔄Ncert Concepts :Inductive Effect, Organic Chemistry, Electronegativity

Arrange the following carbocations in decreasing order of stability: (i) $CH_3CH_2^+$ (ii) $(CH_3)_2CH^+$ (iii) $(CH_3)_3C^+$ (iv) $CH_3^+$

A

(i) > (ii) > (iii) > (iv)

B

(iv) > (i) > (ii) > (iii)

C

(iii) > (ii) > (i) > (iv)

D

(ii) > (iii) > (i) > (iv)

Question Tags

📚 Subject:Chemistry

📑 Chapter:Organic Chemistry: Some basic principles and techniques

🎯Topic:Electron Displacements

PYQ YEAR: 2024

🎓 Ncert Level:Application

🎯Difficulty :Medium

⚡ Time Required :1 mins

🔄Ncert Concepts :Organic Chemistry, Carbocations, Stability, Hyperconjugation

Which factor DOES NOT contribute to the greater stability of a tertiary butyl carbocation compared to a secondary butyl carbocation?

A

Steric hindrance

B

+I effect

C

Hyperconjugation

D

+I effect and Hyperconjugation

Question Tags

📚 Subject:Chemistry

📑 Chapter:Organic Chemistry: Some basic principles and techniques

🎯Topic:Electron Displacements

PYQ YEAR: 2020

🎓 Ncert Level:Analyzing

🎯Difficulty :Easy

⚡ Time Required :1.5 mins

🔄Ncert Concepts :Organic Chemistry, Carbocations, Stability, Inductive Effect, Hyperconjugation, Steric Hindrance

Who pointed out the concept hyperconjugation?

A

Nathan and Baker

B

Mullikan

C

Kekule

D

Kolbe

Question Tags

📚 Subject:Chemistry

📑 Chapter:Organic Chemistry: Some basic principles and techniques

🎯Topic:Electron Displacements

🎓 Ncert Level:Remembering

🎯Difficulty :Easy

⚡ Time Required :1 mins

🔄Ncert Concepts :Hyperconjugation, Organic Chemistry

#NAME?

A

$- {\rm{C}}{{\rm{H}}_3}$

B

$- {\rm{Br}}$

C

$- {\rm{Cl}}$

D

$- {\rm{N}}{{\rm{O}}_2}$

Question Tags

📚 Subject:Chemistry

📑 Chapter:Organic Chemistry: Some basic principles and techniques

🎯Topic:Electron Displacements

🎓 Ncert Level:Understanding

🎯Difficulty :Easy

⚡ Time Required :2 mins

🔄Ncert Concepts :Organic Chemistry, Substituent Effects, Activating Groups, Deactivating Groups

Arrange the following substituents in decreasing order of their $-I$ effect: $-NO_2$ , $-Cl$ , $-Br$ , $-I$

A

$-NO_2 > -Cl > -Br > -I$

B

$-I > -Br > -Cl > -NO_2$

C

$-Cl > -Br > -I > -NO_2$

D

$-Br > -Cl > -I > -NO_2$

Question Tags

📚 Subject:Chemistry

📑 Chapter:Organic Chemistry: Some basic principles and techniques

🎯Topic:Electron Displacements

PYQ YEAR: 2018

🎓 Ncert Level:Application

🎯Difficulty :Easy

⚡ Time Required :1 mins

🔄Ncert Concepts :Inductive Effect, Organic Chemistry, Electronegativity

The effect involving the complete transfer of a shared pair of electrons to one of the atoms joined by a multiple bond at the requirement of attacking reagent is called :

A

Nucleophilic substitution

B

Electrophilic addition

C

Free radical substitution

D

Nucleophilic addition

Question Tags

📚 Subject:Chemistry

📑 Chapter:Organic Chemistry: Some basic principles and techniques

🎯Topic:Electron Displacements

🎓 Ncert Level:Remembering

🎯Difficulty :Easy

⚡ Time Required :1 mins

🔄Ncert Concepts :electromeric effect, electronic effects, organic chemistry

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