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Crowding effect of alkyl group reduce...

Crowding effect of alkyl group reduces basic character of

A

Primary amine

B

Secondary amine

C

Tertiary amine

D

Ammonia

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The correct Answer is:
C
Crowding of alkyl group present in tertiary amine.
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Which is more basic in character?

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 ?

MARVEL PUBLICATION-ORGANIC COMPOUNDS CONTAINGING NITROGEN -TEST YOUR GRASP
  1. Crowding effect of alkyl group reduces basic character of

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  2. IUPAC name of ethyl amine is

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  3. Acetaldoxime on reduction by Na and alcohol produces

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  4. (CH(3))(3) N is

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  5. Ethyl amine reacts with which of the following to give ethyl am...

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  6. Trimethyl amine is less basic than methyl amine because

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  7. n-butyl amine and isobuty amine are

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  8. The true statement about ethylamine is

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  9. The reaction which is given only by primary amines is

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  10. A amine produces yellow oily compound on reaction with nitrous ...

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  11. Which of the following produces diacetyl derivative on reaction w...

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  12. According to Lewis concept R- NH(2)

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  13. Which of the following is quarternary ammonium salt ?

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  14. Methylation of methyl amine gives 1^(st) product as

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  15. Which of the following is absorbed by dilute HCI ?

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  16. Which of the following produces HNO(2) acid ?

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  17. The amine which reacts with NaNO2 and dil. HCl to give yellow oily com...

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  18. Ethyl bromide reacts with excess of alcoholic ammonia the majo...

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  19. When ethylamine is heated with excess of acetic anhydride it giv...

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  20. Dimethanamine is the IUPAC name of

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  21. Methyl amine is obtained by reduction of nitromethane by using w...

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