The correct decreasing order of basic strength of the following species is ….. `H_(2)O, NH_(3), OH^(-),NH_(2)^(-)`

Options

A. `NH_(2)^(-) gt OH^(-) gt NH_3 gt H_2 O`
B. `OH^(-) gt NH_(2)^(-) gt H_2 O gt NH_3`
C. `NH_(3) gt H_2 O gt NH_(2)^(-) gt OH^(-)`
D. `H_(2) O gt NH_(3) gt OH^(-) gt NH_(2)^(-)`

Answer

A

Explanation

`H_2 O` is a stronger acid than `NH_3` or `NH_3` is more basic than water. Conjugate base of weaker acid `NH_3`, i.e., `NH_(2)^(-)` is a stronger base than the conjugate base of stronger acid `(H_2 O)` i.e, `OH^(-)`.
Hence, the order of basic strength is `NH_(2)^(-) gt OH^(-) gt NH_3 gt H_2 O`