Strongest base is

Options

A. `C_(6)H_(5)NH_(2)`
B. `CH_(2)=CHCH_(2)NH_(2)`
C. `HC-=C CH_(2)NH_(2)`
D. `CH_(3)CH_(2)CH_(2)NH_(2)`

Answer

D

Explanation

`C_(6)H_(5)NH_(2)` is the weakest base because the one pair of electrons on the N atom is delocalized over the benzene ring. In `CH_(2)=CHCH_(2)NH_(2)`

and `HC-=C CH_(2)NH_(2),sp^(2)` and sp carbon atoms respectively being more electronegative aattract the lone pair of electrons on N thereby reducing the electron density. in contrast, the +I-effect of `CH_(3)CH_(2)CH_(2)` group increases the electron density on N. thus, `CH_(3)CH_(2)CH_(2)NH_(2)` is the strongest base.