Question

Among the following compounds `C_(3)H_(7)NH_(2)NH_(3)CH_(3)NH_(2)C_(2)H_(5)NH_(2)` and `C_(6)H_(5)NH_(2)` the least basic compounds is .
A. `C_(3)H_(7)NH_(2)`
B. `NH_(3)`
C. `CH_(3)NH_(2)`
D. `C_(6)H_(2)NH_(2)`

Answer 1

Correct Answer - D
Aniline `(C_(6)H_(5)NH_(2))` is the weakest base because the lone pair of electrons on the `N` atom is delocalized throught resonance with the benzene ring

The correct order of basic strength is `C_(6)H_(5)NH_(2) lt NH_(3) lt CH_(3)NH_(2) lt C_(2)H_(5)NH_(2) lt C_(3)H_(7)NH_(2)` .