Strongest nucleophile among the following is:

θ O H (a q)

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H_{2} O (a q)

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{N H}_{3} (a q)

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θ O C_{2} H_{5} (a q)

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Solution

The correct option is D $θ O C_{2} H_{5} (a q)$
Nuceophileicity $\propto e^{-} d e n s i t y$
$\propto + I$
$∴$ anions are better nucleophile than neutral atoms
Now, among $O H^{-}$ and $O E t^{-}$
$E t$ has more $+ I$ then $- H$
$∴ O E t^{-}$ is best nucleophile

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