Among the following, the correct order of basicity is:

N H_{2}^{-} > O H^{-} > R O^{-} > R C O O^{-}

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N H_{2}^{-} > R O^{-} > O H^{-} > R C O O^{-}

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R C O O^{-} > N H_{2}^{-} > R O^{-} > O H^{-}

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R C O O^{-} > R O^{-} > N H_{2}^{-} > O H^{-}

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Solution

The correct option is B $N H_{2}^{-} > R O^{-} > O H^{-} > R C O O^{-}$
Strong acid gives weak conjugate base
Acidic strength order is
$N H_{3} < R O H < H_{2} O < R C O O H$

Hence the basic strength order of conjugate bases of above acids is just reverse:
$N H_{2}^{-} > R O^{-} > O H^{-} > R C O O^{-}$

Hence, option $B$ is correct.

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β -

(B^{⊖})

(I) ⊖ O H (I I) R O^{⊖} (I I I) R C O O^{⊖} (I V) ⊖ C N (V) N O_{3}^{⊖}

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