The correct order of the base strength of the given ions is

A
${NH}_{2}^{-} > {OH}^{-} > {CN}^{-}$
B
${NH}_{2}^{-} > {CN}^{-} > {OH}^{-}$
C
${CN}^{-} > {NH}_{2}^{-} > {OH}^{-}$
D
${CN}^{-} > {OH}^{-} > {NH}_{2}^{-}$

Solution:

The order of the conjugate acid is $HCN > H_{2} O > {NH}_{3}$ . The conjugate base follows the reverse order, i.e. ${NH}_{2}^{-} > {OH}^{-} > {CN}^{-}$

Solution:

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