Which of the following order of basic strength is correct ?

Options

A. `NH_(3) lt NH_(2)OH lt NH_(3) lt NH_(2) -NH_(2)`
B. `NH_(2)OH lt HN_(3) lt NH_(2)-NH_(2) lt NH_(3)`
C. `HN_(3) lt NH_(3) lt NH_(2)OH lt NH_(2)-NH_(2)`
D. `HN_(3) lt NH_(2)OH lt NH_(2)-NH_(2) lt NH_(3)`

Answer

B

Explanation

Basicity in nitrogen compounds is attributed to the availability of lone pair of electrons. The order of availability of `2^(-)` pair on N-atom is :
`NH_(3) gt NH_(2)NH_(2) gt NH_(3) gt NH_(2)OH`.
Therefore , same is the order of basiscity of these compounds.