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1. In a group discussion, a student argued that alkyl amines are more basic than NH3.

  • Is it correct?
  • Justify your answer with suitable explanation. 

2. Arrange the following amines in the decreasing order of basic strength in aqueous solution.

CH3NH2, (CH3)2NH, NH3, (CH3)3N Justify.

1 Answer

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Best answer

1.

  • Yes.
  • Electron realeasing inductive effect (+l) of alkyl groups increases the availability of lone pair on nitrogen.

2. (CH3)2NH > CH3NH2 > (CH3)3N > NH3

Inductive effect is maximum for 3° amines. At the same time steric hindrance is maximum for 3° amines. An interplay of the inductive effect, solvation effect and steric hindrance of the alkyl group decides the basic strength of alkylamines.

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