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In case of substituted aniline the gr...

In case of substituted aniline the group which decreases the basic strength is

A

`-OCH_3`

B

`-CH_3`

C

`-NH_2`

D

`-C_6H_5`

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The correct Answer is:
D
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The decreasing order of basic strength is

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

TARGET PUBLICATION-COMPOUND CONTAINING NITROGEN -COMPETITIVE THINKING
  1. Amines behave as:

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  2. The correct statement regarding the basicity of arylamines is .

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  3. In case of substituted aniline the group which decreases the basic...

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  4. Select the compound which on treatment with nitrous acid liberates nit...

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  5. Diethyl amine when treated with nitrous acid yields

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  6. The amine 'A' when treated with nitrous acid gives yellow oily substan...

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  7. When amine reacts with nitrous acid, the primary, secondary and tertia...

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  8. During acetylation of amines

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  9. Which one of the following compounds when heated with KOH and a primar...

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  10. Which one of the following will give carbylamine test ?

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  11. The reaction of aniline with chloroform under alkaline conditions lead...

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  12. Which of the following reaction does NOT occur ?

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  13. An organic compound X having molecular formula C4H11N reacts with p-to...

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  14. Identify the product 'C' in the folowing reaction. "Aniline"underset...

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  15. Nitration of aniline also gives m-nitro anilime, in stron acidic mediu...

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  16. When aniline is treated will sodium nitrite and hydrochloric acid at 0...

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  17. In Gattermann reaction , a diazonium group is replaced by ulX using u...

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  18. Which of the following is NOT formed by Sandmeyer reaction ?

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  19. Which of the following will not undergo diazotisation?

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  20. Azo-dyes are prepared from

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