Question

The correct decreasing order of basic strength of the following species is

• A. $O{{H}^{-}}>NH_{2}^{-}>{{H}_{2}}O>N{{H}_{3}}$
• B. $NH_{2}^{-}>O{{H}^{-}}>N{{H}_{3}}>{{H}_{2}}O$
• C. $N{{H}_{3}}>{{H}_{2}}O>NH_{2}^{-}>O{{H}^{-}}$
• D. ${{H}_{2}}O>N{{H}_{3}}>O{{H}^{-}}>NH_{2}^{-}$

Answer 1

Answer: (B)

$NH_{2}^{-}>O{{H}^{-}}>N{{H}_{3}}>{{H}_{2}}O$

Answer 2

$N{{H}_{3}}$ is more basic than ${{H}_{2}}O,$ therefore, $NH_{2}^{-}$ is a stronger base than $O{{H}^{-}}$ . Thus, the decreasing order of basic strength is $NH_{2}^{-}>O{{H}^{-}}>N{{H}_{3}}>{{H}_{2}}O$