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Amines are more basic than...

Amines are more basic than

A

alcohols

B

ethers

C

esters

D

All of these

Text Solution

Verified by Experts

The correct Answer is:
D
For the same reason that `NH_(3)` (ammonia) is more basic than `H_(O)` (water) nitrogen is less electronegative than oxygen and hence can better accommodate the positive charge of the resulting cation after accepting the proton .
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All aliphatic amines are more basic than ammonia but due to delocalization of lone pair of electrons of the nitrogen atom on the benzene ring, aniline is a weaker base than ammonia. The basic strength of the substituted anilines, however, depends upon the nature of the substituents. Whereas electron-donating groups tend to increase, electron-withdrawing groups tend to decrease the basic strength. the base strenghening effect of the electron-donating groups and base weakening effect of the electron-withdrawing groups is, however, more pronounced at p-than at m-position. However, due to ortho effect, o-substituted anilines are weaker bases than anilines regardless of the nature of substituent whether electron-donating or electron-withdrawing. Q. What is the order of basicity of I. p-methylaniline II. m-methylaniline III. aniline IV. o-methylaniline.

Assertion: Hofmann's bromamide reaction is given by primary amines. Reason: Primary aminies are more basic than secondary amines.

Knowledge Check

  • The lone pair of amines makes them basic. They react with acids to form acid-base salts. Amines are more basic than alcohols, ethers and water. When an amine is dissolved in water, an equilibrium is established , where water acts as an acid and transfer a proton to the amine. The basic strength of an amine can be measured by basicity constant K_(b) . Arylamines are less basic than alkylamines because the lone pair of nitrogen is delocalised with the aromatic ring and are less available for donation. Substituted arylamines can be either more basic or less basic than aniline , depending on the substituted . ERG substituents, such as -CH_(3), -NH_(2) and -OCH_(3) increases the basicity and EWG substituents , such as -Cl, -NO_(2) and -CN decreases basicity. While sp^(2)- hybridized nitrogen atom in pyridine is less basic then the sp^(3) -hybridized nitrogen in an alkylamine. The most basic carbanion is :

    A
    B
    `CH-=overset(Theta)(C)`
    C
    D

  • The lone pair of amines makes them basic. They react with acids to form acid-base salts. Amines are more basic than alcohols, ethers and water. When an amine is dissolved in water, an equilibrium is established , where water acts as an acid and transfer a proton to the amine. The basic strength of an amine can be measured by basicity constant K_(b) . Arylamines are less basic than alkylamines because the lone pair of nitrogen is delocalised with the aromatic ring and are less available for donation. Substituted arylamines can be either more basic or less basic than aniline , depending on the substituted . ERG substituents, such as -CH_(3), -NH_(2) and -OCH_(3) increases the basicity and EWG substituents , such as -Cl, -NO_(2) and -CN decreases basicity. While sp^(2)- hybridized nitrogen atom in pyridine is less basic then the sp^(3) -hybridized nitrogen in an alkylamine. Select the correct order of K_(b)

    A
    `CH_(3)NH_(2) gt NaOH`
    B
    Pyridine `gt CH_(3)-NH-CH_(3)`
    C
    p-Methyl aniline `gt ` p-Chloroaniline `gt` p-Amino acetophenone
    D
    p-Bromoaniline `gt` p-Nitroaniline `gt` p-Amino benzaldehyde

  • The lone pair of amines makes them basic. They react with acids to form acid-base salts. Amines are more basic than alcohols, ethers and water. When an amine is dissolved in water, an equilibrium is established , where water acts as an acid and transfer a proton to the amine. The basic strength of an amine can be measured by basicity constant K_(b) . Arylamines are less basic than alkylamines because the lone pair of nitrogen is delocalised with the aromatic ring and are less available for donation. Substituted arylamines can be either more basic or less basic than aniline , depending on the substituted . ERG substituents, such as -CH_(3), -NH_(2) and -OCH_(3) increases the basicity and EWG substituents , such as -Cl, -NO_(2) and -CN decreases basicity. While sp^(2)- hybridized nitrogen atom in pyridine is less basic then the sp^(3) -hybridized nitrogen in an alkylamine. pK_(b) order of the following compound is : (I) NH_(2)OH" "(II) NH_(2)NH_(2)" "(III) NH_(3)" "(IV)H_(2)O

    A
    `IV gt I gt II gt III`
    B
    `III gt II gt I gt IV`
    C
    `I gt IV gt II gt III`
    D
    `III gt I gt II gt IV`

    • Similar Questions

    Explore conceptually related problems

    Which of the following is correct statement about basicity of a mines ? (1) smaller the value of pKb weaker the base (2) Electron donating group increases the basicity of amines (3)d Electron withdrawing group decrease the basicity of amines (3) Electron withdrawing group decrease the basicity of amines (4) Aromatic amines are more basic than in aqueous amines ?

    All aliphatic amines are more basic than ammonia but due to delocalisation of lone pair of electrons of the nitrogen atom on the benzene ring, aniline is a weaker base than ammonia. The basic strength of the substituted anilines, however, depends upon the nature of the substituent whereas electron donating group tend to increase, electron-with drawing groups tend to decrease the basic strength. The base trengthening effect of the electron-donating group and the base weaken effect of the electron withdrawing group is, however, more pronouned at p-than at m-position. However due to ortho effect, o-substituted anilines are weaker bases than anilines regardless of the nature of substituent whether electron-donating or electron withdrawing. Choose among the following amines the correct decreasing order of their basic strength

    Aminea are more basic than

    All aliphatic amines are more basic than ammonia but due to delocalisation of lone pair of electrons of the nitrogen atom on the benzene ring, aniline is a weaker base than ammonia. The basic strength of the substituted anilines, however, depends upon the nature of the substituent whereas electron donating group tend to increase, electron-with drawing groups tend to decrease the basic strength. The base trengthening effect of the electron-donating group and the base weaken effect of the electron withdrawing group is, however, more pronouned at p-than at m-position. However due to ortho effect, o-substituted anilines are weaker bases than anilines regardless of the nature of substituent whether electron-donating or electron withdrawing. Select the weakest base among the following

    All aliphatic amines are more basic than ammonia but due to delocalization of lone pair of electrons of the nitrogen atom on the benzene ring, aniline is a weaker base than ammonia. The basic strength of the substituted anilines, however, depends upon the nature of the substituents. Whereas electron-donating groups tend to increase, electron-withdrawing groups tend to decrease the basic strength. the base strenghening effect of the electron-donating groups and base weakening effect of the electron-withdrawing groups is, however, more pronounced at p-than at m-position. However, due to ortho effect, o-substituted anilines are weaker bases than anilines regardless of the nature of substituent whether electron-donating or electron-withdrawing. Q. Among the following, weakest base is

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