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How is the basic strength of aromatic a...

How is the basic strength of aromatic amines affected by the presence of electron releasing group on the benzene ring?

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An electron-releasing group increases the electron density on the N-atom. As a result, its tendency to donate an electron pair to a proton increases and hence the basicity of the amine increases.
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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. Which of the following group does not decrease the basic strength of aniline ?

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. Which of the following statement is not correct?

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. The strongest base among the following is

PRADEEP-ORGANIC COMPOUNDS CONTAINING NITROGEN-ADDITIONAL QUESTIONS (VERY SHORT ANSWER QUESTIONS)
  1. Which is more acidic (or basic), aniline or ammonia?

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  2. Arrange the following in decreasing order of their basic strength: amm...

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  3. How is the basic strength of aromatic amines affected by the presence...

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  4. Arrange the following in the increasing order of their basicities. (...

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  5. Arrange the following in increasing order of their acid strength: meth...

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  6. CH(3)CONH(2) is a weaker base than CH(3)CH(2)NH(2).

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  7. Give the structures of the products A, B and C in the following reacti...

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  8. How will you canvert the following : (i) Nitrobenzene into aniline, ...

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  9. The product of mustard oil reaction is

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  10. Give a chemical test to distinguish between a primary and a secondary ...

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  11. Electrophilic substitution in case of aromatic amines takes place more...

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  12. Direct nitration of aniline is not carried out. Explain.

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  13. Give reason: Aniline gets coloured on standing in air for a long time...

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  14. Which of the following exists as a zwitterion?

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  15. Mention two important uses of sulphanilic acid.

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  16. Statement 1: Primary, secondary and tertiary amines can be separated b...

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  17. Compound A (C(3)H(9)N) reacts with benzene sulphonyl chloride to form ...

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  18. Metntion the chief use of quaternary ammonium salts derived from long ...

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  19. What is diazotisation

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  20. Write the structure of benzenediazonium chloride?

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