Ncert Exercises & Solutions

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

$H_{2} O, {NH}_{3}, {OH}^{-}, {NH}_{2}^{}$

$1 . {NH}_{2}^{-} > {OH}^{-} > {NH}_{3} > H_{2} O$
$2 . {OH}^{-} > {NH}_{2}^{-} > H_{2} O > {NH}_{3}$
$3 . {NH}_{3} > H_{2} O > {NH}_{2}^{-} > {OH}^{-}$
$4 . H_{2} O > {NH}_{3} > {OH}^{-} > {NH}_{2}^{-}$

HINT: Conjugate acid-pair strength

EXPLANATION:

The basic strength of the above species can be explained on the basis of the electronegativity of the central atom and its proton-accepting tendency. Here, amide ion is most basic among given compounds due to the presence of negative charge and two pairs of electrons on the nitrogen atom.

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