All aliphatic amines are more basic than ammonia but due to delocalisation of lone pair of electrons of the nitrogen atom on the benzene ring, aniline is a weaker base than ammonia. The basic strength of the substituted anilines, however, depends upon the nature of the substituent whereas electron donating group tend to increase, electron-with drawing groups tend to decrease the basic strength. The base trengthening effect of the electron-donating group and the base weaken effect of the electron withdrawing group is, however, more pronouned at p-than at m-position. However due to ortho effect, o-substituted anilines are weaker bases than anilines regardless of the nature of substituent whether electron-donating or electron withdrawing. The correct order of increasing basic nature of the following bases is

All aliphatic amines are more basic than ammonia but due to delocalisa

1.	All aliphatic amines are more basic than ammonia but due to delocalisation of lone pair of electrons of the nitrogen atom on the benzene ring, aniline is a weaker base than ammonia. The basic strength of the substituted anilines, however, depends upon the nature of the substituent whereas electron donating group tend to increase, electron-with drawing groups tend to decrease the basic strength. The base trengthening effect of the electron-donating group and the base weaken effect of the electron withdrawing group is, however, more pronouned at p-than at m-position. However due to ortho effect, o-substituted anilines are weaker bases than anilines regardless of the nature of substituent whether electron-donating or electron withdrawing. The correct order of increasing basic nature of the following bases is
Answer» `2 gt 1 lt 3 lt 4` `2 lt 1 gt lt 4` `2 lt 1 gt 4 lt 3` `2 lt 1 lt 3 lt 4`. SOLUTION :Electron DONATING group increase while electron with drawing groups decrease the BASICITY, i.e., basicity increases in the order `2 lt 1 lt 3 lt 4`