1.

    Among the following the dissociation constant is highest for

    A

    C6H5OH{{\rm{C}}_6}{{\rm{H}}_5}{\rm{OH}}

    B

    C6H5CH2OH{{\rm{C}}_6}{{\rm{H}}_5}{\rm{C}}{{\rm{H}}_2}{\rm{OH}}

    C

    CH3−C≡CH{\rm{C}}{{\rm{H}}_3} - {\rm{C}} \equiv {\rm{CH}}

    D

    CH3NH3+Cl−{\rm{C}}{{\rm{H}}_3}{\rm{NH}}_3^ + {\rm{C}}{{\rm{l}}^ - }

    Question Tags
    📚 Subject:Chemistry
    📑 Chapter:Organic Chemistry: Some basic principles and techniques
    🎯Topic:Electron Displacements
    🎓 Ncert Level:Analyzing
    🎯Difficulty :Medium
    ⚡ Time Required :2 mins
    🔄Ncert Concepts :dissociation constant, acidity, conjugate base stability, inductive effect, resonance

    Related Questions

    1.

    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

    2.

    In Lassaigne’s test, a black colour is obtained if the organic compound contains sulphur. The black colour is due to

    A

    Pb(CH3COO)2Pb{(C{H_3}COO)_2}

    B

    PbSPbS

    C

    CuSCuS

    D

    CH3COONaC{H_3}COONa

    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 :Lassaigne's test, qualitative analysis, chemical reactions, lead sulfide

    3.

    The correct order of stability of the following resonating structures of formate ion (HCOO-) is:

    A

    I > II > III

    B

    I = II > III

    C

    III > II > I

    D

    II > I > III

    Question Tags
    📚 Subject:Chemistry
    📑 Chapter:Organic Chemistry: Some basic principles and techniques
    🎯Topic:Electron Displacements
    🎓 Ncert Level:Analyzing
    🎯Difficulty :Hard
    ⚡ Time Required :1.5 mins
    🔄Ncert Concepts :Resonance, Stability of Resonating Structures, Formate Ion

    4.

    Which of the chloride is less reactive towards hydrolysis?

    A

    Vinyl chloride

    B

    Allyl chloride

    C

    Ethyl chloride

    D

    t−t - butyl chloride

    Question Tags
    📚 Subject:Chemistry
    📑 Chapter:Organic Chemistry: Some basic principles and techniques
    🎯Topic:Electron Displacements
    🎓 Ncert Level:Analyzing
    🎯Difficulty :Medium
    ⚡ Time Required :2 mins
    🔄Ncert Concepts :Hydrolysis, Reactivity, Carbocation stability, Resonance

    5.

    Which of the following order is correct regarding the acidity of carboxylic acids?

    A

    Cl3CCOOH>Cl2CHCOOH>ClCH2COOH{\rm{C}}{{\rm{l}}_3}{\rm{CCOOH}} > {\rm{C}}{{\rm{l}}_2}{\rm{CHCOOH}} > {\rm{ClC}}{{\rm{H}}_2}{\rm{COOH}}

    B

    Cl3CCOOH>Cl2CHCOOH<ClCH2COOH{\rm{C}}{{\rm{l}}_3}{\rm{CCOOH}} > {\rm{C}}{{\rm{l}}_2}{\rm{CHCOOH}} < {\rm{ClC}}{{\rm{H}}_2}{\rm{COOH}}

    C

    Cl3CCOOH⟨Cl2CHCOOH⟩ClCH2COOH{\rm{C}}{{\rm{l}}_3}{\rm{CCOOH}}\left\langle {{\rm{C}}{{\rm{l}}_2}{\rm{CHCOOH}}} \right\rangle {\rm{ClC}}{{\rm{H}}_2}{\rm{COOH}}

    D

    Cl3CCOOH<Cl2CHCOOH<ClCH2COOH{\rm{C}}{{\rm{l}}_3}{\rm{CCOOH}} < {\rm{C}}{{\rm{l}}_2}{\rm{CHCOOH}} < {\rm{ClC}}{{\rm{H}}_2}{\rm{COOH}}

    Question Tags
    📚 Subject:Chemistry
    📑 Chapter:Organic Chemistry: Some basic principles and techniques
    🎯Topic:Electron Displacements
    🎓 Ncert Level:Analyzing
    🎯Difficulty :Medium
    ⚡ Time Required :2 mins
    🔄Ncert Concepts :acidity of carboxylic acids, inductive effect, electron-withdrawing groups

    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

    R−CH=CR2R - CH = C{R_2}

    C

    R−CH=CH−RR - CH = CH - R

    D

    R−CH=CH2R - CH = C{H_2}

    Question Tags
    📚 Subject:Chemistry
    📑 Chapter:Organic Chemistry: Some basic principles and techniques
    🎯Topic:Electron Displacements
    🎓 Ncert Level:Application
    🎯Difficulty :Easy
    ⚡ Time Required :2 mins
    🔄Ncert Concepts :alkene stability, hyperconjugation, substitution

    7.

    The electromeric effect in organic compounds is a :

    A

    Temporary effect

    B

    Permanent effect

    C

    Temporary-permanent effect

    D

    None of the above

    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, Organic chemistry

    8.

    The −I - I effect is shown by :

    A

    −COOH - {\rm{COOH}}

    B

    −CH3 - {\rm{C}}{{\rm{H}}_3}

    C

    −CH3CH2 - {\rm{C}}{{\rm{H}}_3}{\rm{C}}{{\rm{H}}_2}

    D

    −CHR2 - {\rm{CH}}{R_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 :Inductive effect, Electron withdrawing groups

    9.

    Most stable carbanion

    A

    C‾H2−CH2−NO2\overline C {H_2} - C{H_2} - N{O_2}

    B

    C‾H2−CH2−CN\overline C {H_2} - C{H_2} - CN

    C

    C‾H2−CH2−COOH\overline C {H_2} - C{H_2} - COOH

    D

    C‾H2−CH2−CH2−CH2−F\overline C {H_2} - C{H_2} - C{H_2} - C{H_2} - F

    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 :carbanion stability, inductive effect, resonance, electronegativity

    10.

    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
    📚 Subject:Chemistry
    📑 Chapter:Organic Chemistry: Some basic principles and techniques
    🎯Topic:Electron Displacements
    PYQ YEAR: 2020
    🎓 Ncert Level:Understanding
    🎯Difficulty :Easy
    ⚡ Time Required :1 mins
    🔄Ncert Concepts :Organic Chemistry, Carbocations, Stability, Inductive Effect, Hyperconjugation

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