1.

    Arrange the following carbocations in decreasing order of stability:

    I. (CH3)3C+(CH_3)_3C^+

    II. (CH3)2CH+(CH_3)_2CH^+

    III. CH3CH2+CH_3CH_2^+

    IV. CH3+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

    Related Questions

    1.

    Which of the following alkyl groups has the maximum +I + I effect

    A

    (CH3)2CH−{\left( {C{H_3}} \right)_2}CH{\rm{ }} -

    B

    (CH3)3C−{\left( {C{H_3}} \right)_3}C -

    C

    CH3CH2−C{H_3}C{H_2} -

    D

    CH3−C{H_3} -

    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 :Inductive effect, Alkyl groups, Electron donating groups

    2.

    The hyperconjugation effect involves the delocalization of:

    A

    π electrons

    B

    σ electrons of C-H bond

    C

    Lone pair electrons

    D

    None of the above

    Question Tags
    📚 Subject:Chemistry
    📑 Chapter:Organic Chemistry: Some basic principles and techniques
    🎯Topic:Electron Displacements
    🎓 Ncert Level:Remembering
    🎯Difficulty :Medium
    ⚡ Time Required :1 mins
    🔄Ncert Concepts :Hyperconjugation, Sigma bond, Electron delocalization

    3.

    Hyperconjugation involves overlap of the following orbitals

    A

    σ−σ\sigma - \sigma

    B

    σ−ρ\sigma - \rho

    C

    p−pp - p

    D

    π−π\pi - \pi

    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, orbital overlap, sigma bond, p orbital

    4.

    Stability of which intermediate is not governed by hyperconjugation?

    A

    Carbon cation

    B

    Carbon anion

    C

    Carbon free radical

    D

    None of these

    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 :hyperconjugation, carbocation stability, carbanion stability, free radical stability

    5.

    Orbital interaction between the σ\sigma - bonds of a substituent group and a neighbouring π\pi - orbital is known as

    A

    Hyperconjugation

    B

    Inductive effect

    C

    Steric effect

    D

    Electric quadrapole interactions

    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, sigma bonds, pi orbitals

    6.

    Amongst the following the compound that can most readily get sulphonated is

    A

    Benzene

    B

    Toluene

    C

    Nitrobenzene

    D

    Chlorobenzene

    Question Tags
    📚 Subject:Chemistry
    📑 Chapter:Organic Chemistry: Some basic principles and techniques
    🎯Topic:Electron Displacements
    🎓 Ncert Level:Application
    🎯Difficulty :Medium
    ⚡ Time Required :2 mins
    🔄Ncert Concepts :Electrophilic Aromatic Substitution, Sulfonation, Activating and Deactivating Groups

    7.

    Which of the following orders is correct regarding the −I-I effect of the substituents?

    A

    −NR2>−OR>−F - {\rm{N}}{R_2} > - {\rm{O}}R > - {\rm{F}}

    B

    −NR2<−OR<−F - {\rm{N}}{R_2} < - {\rm{O}}R < - {\rm{F}}

    C

    −NR2>−OR<−F - {\rm{N}}{R_2} > - {\rm{O}}R < - {\rm{F}}

    D

    −NH2<−OR>−F - {\rm{N}}{{\rm{H}}_2} < - {\rm{O}}R > - {\rm{F}}

    Question Tags
    📚 Subject:Chemistry
    📑 Chapter:Organic Chemistry: Some basic principles and techniques
    🎯Topic:Electron Displacements
    🎓 Ncert Level:Understanding
    🎯Difficulty :Hard
    ⚡ Time Required :2 mins
    🔄Ncert Concepts :inductive effect, electronegativity

    8.

    The resonating structures :

    A

    Differ only in the arrangement of electrons

    B

    Differ in number of paired and unpaired electrons

    C

    Differ largely in their energy contents

    D

    Do not lie in the same plane

    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 :Resonance, Resonance Structures, Electron Arrangement

    9.

    Chlorobenzene is 0, p-directing in electrophilic substituting reaction. The directing influence is explained by

    A

    +M + M of Ph

    B

    +I + I of Cl

    C

    +M + M of Cl

    D

    −I - I of Ph

    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 :electrophilic aromatic substitution, directing groups, resonance, inductive effect

    10.

    The bond that undergoes heterolytic cleavage most easily is

    A

    C−O{\rm{C}} - {\rm{O}}

    B

    C−C{\rm{C}} - {\rm{C}}

    C

    C−H{\rm{C}} - {\rm{H}}

    D

    O−H{\rm{O}} - {\rm{H}}

    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 :heterolytic cleavage, electronegativity, bond polarity

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