The decreasing order of strength of the bases, `OH^(-), NH_(2)^(-), H-C-=C^(-)` and `CH_(3)-CH_(2)^(-)`:

Options

A. `CH_(3)-CH_(2)^(-)gtNH_(2)^(-)gtH-C-=C^(-)gtOH^(-)`
B. `H-C-=C^(-)gtCH_(3)-CH_(2)^(-)gtNH_(2)^(-)gtOH^(-)`
C. `OH^(-)gtNH_(2)^(-)gtH-C-=C^(-)gtCH_(3)-CH_(2)^(-)`
D. `NH_(2)^(-)gtH-C-=C^(-)gtOH^(-)gtCH_(3)-CH_(2)^(-)`

Answer

A

Explanation

`CH_(3)-CH_(3)` is neutral or least acidic and thus its conjugate base should be strongest.