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Monday, February 3, 2020

How is base strength related to the availabihty of the electron-pair?

Base strength depends on the ability of the basic site (which always has an unshared electron pair) to accept a proton. This ability depends on the charge in an anion or electron density in a molecular base. For species with an identical charge, dispersal or delocalization of the electrons from the basic site to other parts of the molecule results in decreased electron density and decreased base strength.

Related Questions:
  1. What is relative basic strength order 1° amines , 2°amines and 3° amines ? 
  2. Explain:Arrange the following in the increasing order of their acid strength : Methyl amine, Dimethyl amine, Aniline, N-methyl aniline (I.I.T, 1988).
  3. What is Carbylamine test or Isocyanide test ?
  4. What is Hinsberg's reagent and where Hinsberg's test use?
  5. Can we prepare aniline by Gabriel – phthalimide reaction?
  6. N-Ethyl-N-methyl propanamine does not show optical activity why?
  7. What is relative basic strength order 1° amines , 2°amines and 3° amines ? Explain:
  8. Amines are more basic than ammonia why?
  9. Give an explanation for the fact that Guanidine NH=C(CH3)2 is a stronger base than most of amines?
  10. Arrange in correct order of basic Character of aniline, pyrrol, pyridine and piperidine?
  11. What is correct basicity order of pyridine, pyridazine, pyrimidine and pyrazine ?
  12. Give an explanation for the fact that Guanidine NH=C(CH3)2 is a stronger base than most of amines?
  13. Arrange in correct order of basic Character of aniline, pyrrol, pyridine and piperidine?
  14. What is correct basicity order of pyridine, pyridazine, pyrimidine and pyrazine ?
  15. Why pyridine is more basic than Pyrrole?
  16. Why pyrimidine is less basic than pyridine?
  17. Imidazole is more basic than pyridine? Why?
  18. Biological Important of Imidazole and structure:
  19. Pyridine is almost 1 million times less basic than piperidine? Why?
  20. Cyclohexylamine amine is the stronger base than Aniline? Why?
  21. Tetrahydroquinoline amine is the stronger base than Tetrahydroisoquinoline? Why?

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