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Why is an alkylamine more basic than amm...

Why is an alkylamine more basic than ammonia ?

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The alkyl groups due to their +I effect, increase the electron density on N-atom thereby resulting in the increase in basicity.
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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 :

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ICSE-ORGANIC COMPOUNDS CONTAINING NITROGEN-EXERCISE (PART-II DESCRIPTIVE QUESTIONS- VERY SHORT ANSWER QUESTIONS )
  1. Which type of amines are prepared by Gabriel phthalimide reaction?

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  2. Why aniline appears red in colour on standing in air for a long time?

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  3. Why is an alkylamine more basic than ammonia ?

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  4. Do as directed : (i) Arrange the following compounds in the increasi...

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  5. Of methylamine and aniline, which is a stronger base and why?

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  6. Cyclohexylamine is stronger base than aniline because

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  7. CH3 CONH2 is a weaker base than CH3 CH2 NH2.

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

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  9. Identify A and B in the following sequence : CH3COOC2 H5 overset(NH...

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  10. Why is carbon-nitrogen bond length in aromatic amines shorter than in ...

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  11. How is phenylaminomethane obtained from phenylnitrile ?

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  12. How is aminoethane obtained from ethanal ?

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

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  14. How is aniline obtained from benzoic acid ?

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  15. Illustrate the following with an example : Acetylation reaction.

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  16. Give chemical tests to distinguish between the following| pair of comp...

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  17. State the reaction taking place when : Bromine water is added to the a...

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  18. Give a chemical test to distinguish between aniline and N-methylanilin...

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  19. How is m-nitroaniline obtained from nitrobenzene?

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  20. Direct nitration of aniline is not carried out. Explain why?

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