Home
Class 12
CHEMISTRY
Maximum pKb value of...

Maximum `pK_b` value of

A

`(CH_(3))_(2)NH`

B

`(CH_(3)CH_(2))_(2)NH`

C

D

Text Solution

Verified by Experts

The correct Answer is:
C
Lone pair of electrons on nitrogen involved in the resonance
Doubtnut Promotions Banner Mobile Dark
|

Topper's Solved these Questions

  • AMINES & DIAZO COMPOUNDS

    NARAYNA|Exercise Level -IV|30 Videos

  • AMINES & DIAZO COMPOUNDS

    NARAYNA|Exercise Level -I (H.w)|19 Videos

  • AMINES & DIAZO COMPOUNDS

    NARAYNA|Exercise Previous year|9 Videos

  • ALDEHYDES, KETONES & CARBOXYLIC ACIDS

    NARAYNA|Exercise CHECK YOUR GRASP|6 Videos

  • BIOMOLECULES

    NARAYNA|Exercise EXERCISE-4 (NCERT EXAMPLAR PROBLEMS)|12 Videos

Similar Questions

Explore conceptually related problems

Which has maximum pK_a value ?

Which has maximum pK_(a) value ?

Knowledge Check

  • Maximum pK_(b) value is of

    A
    B
    `(CH_(3)CH_(2))_(2)NH`
    C
    `(CH_(3))_(2)NH`
    D

  • Maximum pK_(b) value is of

    A
    `(CH_(3)) _(2)NH`
    B
    `(CH_(3)CH_(2)) _(2)NH`
    C
    D

  • Amines are basic in nature due to the presence of lone pair of electrons on N atom of -NH_(2) group. The basic strength of amines can be expressed by their dissociation constant, K_(b) or pK_(b) . RNH_(2) + H_(2) to R NH_(3)^(+) + OH^(-) K_(b) = ([RHH_(3)^(+)][OH^(-)])/([RNH_(2)]) and pK_(b) = -log K_(b) Greater the K_(b) value or smaller the pK_(b) value, more is the basic strength of amine. Aliphatic amines are stronger bases than ammonia due to the electron releasing effect of alkyl groups. The basic strength among amines decreases as : 2^(@) gt 1^(@) gt 3^(@) Aryl amines such as aniline are less basic than aliphatic amines due to the involvement of lone pair of electrons on N atom with the resonance in benzene. In derivatives of aniline, the electron releasing groups increase the basic strength while electron withdrawing groups decrease the basic strength. The base weakening effect of electron withdrawing group and base strengthening effect of electron releasing group is more marked at p-position than at m-position. Every o- substituted aniline is less basic than aniline due to ortho effect. Maximum pK_(b) value is of

    A
    `(CH_(3)CH_(2))_(2)NH`
    B
    C
    `(CH_(3))_(2)NH`
    D

    • Similar Questions

    Explore conceptually related problems

    Electron releasing group pushes electrons to ward nitrogen and hence increases the availability of lone pair of electrons and thus increases its basicity on the other hand, electron with drawing group decreases the availability hence makes the amine less basic Which of the following has maximum pK_b value?

    Which of the following has maximum pK_(a) value?

    Which of the following have maximum value of pK_(b) in Aqueous phase-

    The pK_(a) " pK_(b) values of some bases are as follows. Which is strongest base ?

    Which has maximum pk_alpha value?

    Home
    Profile