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Why aniline appears red in colour on sta...

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

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Due to strong +R effect of `NH_2` group, the electron density on the benzene ring increases. As a result, aniline is easily oxidised on standing in air for a long time to form coloured products.
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ICSE-ORGANIC COMPOUNDS CONTAINING NITROGEN-EXERCISE (PART-II DESCRIPTIVE QUESTIONS- VERY SHORT ANSWER QUESTIONS )
  1. Why amines are less soluble in water as compared to alcohols?

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  2. Which type of amines are prepared by Gabriel phthalimide reaction?

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

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  4. Why is an alkylamine more basic than ammonia ?

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

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

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  7. Cyclohexylamine is stronger base than aniline because

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

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

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

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

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  12. How is phenylaminomethane obtained from phenylnitrile ?

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  13. How is aminoethane obtained from ethanal ?

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

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  15. How is aniline obtained from benzoic acid ?

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

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

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

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

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  20. How is m-nitroaniline obtained from nitrobenzene?

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