Amines have a lone pair of electrons on nitrogen atom due to which they behave as Lewis base. Greater the value of Kb or smaller the value of pKb, stronger is the base. Amines are more basic than alcohols, ethers, esters, etc. The basic character of aliphatic amines should increase with the increase of alkyl substitution. But it does not occur in a regular manner as a secondary aliphatic amine is unexpectedly more basic than a tertiary amine in aqueous solutions. Aromatic amines are weaker bases than ammonia and aliphatic amines. Electron releasing groups such as –CH₃, –OCH₃, –NH₂, etc., increase the basicity while electron-withdrawing substituents such as –NO₂, –CN, halogens etc., decrease the basicity of amines. The effect of these substitute is more at p⁻ than at m⁻ position.

Question

CASE_STUDIESBasic Character of AminesComparison of Basicity of Aliphatic and Aromatic AminesCBSE PYQ3 sub-questions

Loading...

Write reasons for the following :

Account for the following :

Boiling Points of Amines

Basic Character of Amines

Electrophilic Substitution in Aromatic Amines

Aromatic primary amines cannot be prepared by Gabriel Phthalimide synthesis. Why ?

Aniline is a weaker base than alkyl amines. Why ?

Arrange the following in the increasing order of basic strength in aqueous solution : (CH3CH2)2NH, (C2H5)3N, C2H5NH2

Among the following, which is the strongest base?