1.

    Which of the following effects primarily contributes to the enhanced stability of a t-butyl carbocation compared to an isopropyl carbocation?

    A

    Resonance effect

    B

    Inductive effect (+I)

    C

    Hyperconjugation

    D

    Both +I effect and hyperconjugation

    Question Tags
    πŸ“š Subject:Chemistry
    πŸ“‘ Chapter:Organic Chemistry: Some basic principles and techniques
    🎯Topic:Electron Displacements
    PYQ YEAR: 2020
    πŸŽ“ Ncert Level:Understanding
    🎯Difficulty :Easy
    ⚑ Time Required :1 mins
    πŸ”„Ncert Concepts :Organic Chemistry, Carbocations, Stability, Inductive Effect, Hyperconjugation

    Related Questions

    1.

    Who pointed out the concept hyperconjugation?

    A

    Nathan and Baker

    B

    Mullikan

    C

    Kekule

    D

    Kolbe

    Question Tags
    πŸ“š Subject:Chemistry
    πŸ“‘ Chapter:Organic Chemistry: Some basic principles and techniques
    🎯Topic:Electron Displacements
    πŸŽ“ Ncert Level:Remembering
    🎯Difficulty :Easy
    ⚑ Time Required :1 mins
    πŸ”„Ncert Concepts :Hyperconjugation, Organic Chemistry

    2.

    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

    βˆ’I - I of Ph

    Question Tags
    πŸ“š Subject:Chemistry
    πŸ“‘ Chapter:Organic Chemistry: Some basic principles and techniques
    🎯Topic:Electron Displacements
    πŸŽ“ Ncert Level:Understanding
    🎯Difficulty :Easy
    ⚑ Time Required :2 mins
    πŸ”„Ncert Concepts :electrophilic aromatic substitution, directing groups, resonance, inductive effect

    3.

    Arrange pp- toluidine (I) N,N-dimethyl-pp- toluidine (II) pp- nitroaniline (III) and aniline (IV) in order of decreasing basicity

    A

    I>IV>III>II

    B

    I>II>III>IV

    C

    II>I>IV>III

    D

    III>I>II>IV

    Question Tags
    πŸ“š Subject:Chemistry
    πŸ“‘ Chapter:Organic Chemistry: Some basic principles and techniques
    🎯Topic:Electron Displacements
    πŸŽ“ Ncert Level:Analyzing
    🎯Difficulty :Hard
    ⚑ Time Required :3 mins
    πŸ”„Ncert Concepts :Basicity of amines, substituent effects, resonance, inductive effect

    4.

    Correct gradation of basic charactor

    A

    NH3CH3NH2>NF3{\rm{N}}{{\rm{H}}_3}{\rm{C}}{{\rm{H}}_3}{\rm{N}}{{\rm{H}}_2} > N{{\rm{F}}_3}

    B

    CH3NH2>NH3>NF3{\rm{C}}{{\rm{H}}_3}{\rm{N}}{{\rm{H}}_2} > N{{\rm{H}}_3} > N{{\rm{F}}_3}

    C

    NF3>CH3NH2>NH3{\rm{N}}{{\rm{F}}_3} > C{{\rm{H}}_3}{\rm{N}}{{\rm{H}}_2} > N{{\rm{H}}_3}

    D

    CH3NH2>NF3>NH3{\rm{C}}{{\rm{H}}_3}{\rm{N}}{{\rm{H}}_2} > N{{\rm{F}}_3} > N{{\rm{H}}_3}

    Question Tags
    πŸ“š Subject:Chemistry
    πŸ“‘ Chapter:Organic Chemistry: Some basic principles and techniques
    🎯Topic:Electron Displacements
    πŸŽ“ Ncert Level:Analyzing
    🎯Difficulty :Medium
    ⚑ Time Required :3 mins
    πŸ”„Ncert Concepts :Basicity, Inductive Effect, Lone Pair Availability, Electronegativity

    5.

    Which one of the following does not show resonance?

    A

    Carbon dioxide

    B

    Benzene

    C

    Nitromethane

    D

    Propane

    Question Tags
    πŸ“š Subject:Chemistry
    πŸ“‘ Chapter:Organic Chemistry: Some basic principles and techniques
    🎯Topic:Electron Displacements
    πŸŽ“ Ncert Level:Application
    🎯Difficulty :Easy
    ⚑ Time Required :2 mins
    πŸ”„Ncert Concepts :Resonance, Lewis structures, Molecular structure, Bonding

    6.

    Which of the following alkene is maximum stable (R=CH3)(R = C{H_3})

    A

    R2C=CR2{R_2}C = C{R_2}

    B

    Rβˆ’CH=CR2R - CH = C{R_2}

    C

    Rβˆ’CH=CHβˆ’RR - CH = CH - R

    D

    Rβˆ’CH=CH2R - CH = C{H_2}

    Question Tags
    πŸ“š Subject:Chemistry
    πŸ“‘ Chapter:Organic Chemistry: Some basic principles and techniques
    🎯Topic:Electron Displacements
    πŸŽ“ Ncert Level:Understanding
    🎯Difficulty :Easy
    ⚑ Time Required :2 mins
    πŸ”„Ncert Concepts :alkene stability, hyperconjugation, substitution

    7.

    Which of the following is the weakest base?

    A

    Ethyl amine

    B

    Ammonia

    C

    Dimethyl amine

    D

    Methyl amine

    Question Tags
    πŸ“š Subject:Chemistry
    πŸ“‘ Chapter:Organic Chemistry: Some basic principles and techniques
    🎯Topic:Electron Displacements
    πŸŽ“ Ncert Level:Analyzing
    🎯Difficulty :Medium
    ⚑ Time Required :2 mins
    πŸ”„Ncert Concepts :Basicity of amines, Inductive effect, Alkyl groups

    8.

    Resonance in benzene is accompanied by delocalisation of Ο€\pi - electrons. Each Ο€\pi - electron is attached with :

    A

    4 carbon

    B

    2 carbon

    C

    3 carbon

    D

    6 carbon

    Question Tags
    πŸ“š Subject:Chemistry
    πŸ“‘ Chapter:Organic Chemistry: Some basic principles and techniques
    🎯Topic:Electron Displacements
    πŸŽ“ Ncert Level:Understanding
    🎯Difficulty :Easy
    ⚑ Time Required :2 mins
    πŸ”„Ncert Concepts :Resonance, Delocalization, Benzene structure, Pi electrons

    9.

    Which of the following alkene is maximum stable (R=CH3)(R = C{H_3})

    A

    R2C=CR2{R_2}C = C{R_2}

    B

    Rβˆ’CH=CR2R - CH = C{R_2}

    C

    Rβˆ’CH=CHβˆ’RR - CH = CH - R

    D

    Rβˆ’CH=CH2R - CH = C{H_2}

    Question Tags
    πŸ“š Subject:Chemistry
    πŸ“‘ Chapter:Organic Chemistry: Some basic principles and techniques
    🎯Topic:Electron Displacements
    πŸŽ“ Ncert Level:Application
    🎯Difficulty :Easy
    ⚑ Time Required :2 mins
    πŸ”„Ncert Concepts :alkene stability, hyperconjugation, substitution

    10.

    Among the following four compounds:

    A

    CH3CH2OH (Ethanol)

    B

    CH3COOH (Acetic acid)

    C

    CH3CH3 (Ethane)

    D

    CH3OCH3 (Dimethyl ether)

    Question Tags
    πŸ“š Subject:Chemistry
    πŸ“‘ Chapter:Organic Chemistry: Some basic principles and techniques
    🎯Topic:Electron Displacements
    πŸŽ“ Ncert Level:Analyzing
    🎯Difficulty :Medium
    ⚑ Time Required :2 mins
    πŸ”„Ncert Concepts :acidity, substituent effects, phenol

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