The correct order of rate of ${S_{N}}^{2}$ reactivity of $H_{2} O$ , $^{-} O C H_{3},^{-} O H$ and $C H_{3} C O O^{-}$ is

^{-} O H >^{-} O C H_{3} > C H_{3} C O O^{-} > H_{2} O

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H_{2} O >^{-} O H >^{-} O C H_{3} > C H_{3} C O O^{-}

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^{-} O C H_{3} >^{-} O H > C H_{3} C O O^{-} > H_{2} O

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H_{2} O > C H_{3} C O O^{-} >^{-} O H >^{-} O C H_{3}

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Solution

The correct option is C $^{-} O C H_{3} >^{-} O H > C H_{3} C O O^{-} > H_{2} O$
For ${S_{N}}^{2}$ reaction, the rate depends on the strength of the nucleophile.

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{S_{N}}^{2}

H_{2} O

^{-} O C H_{3},^{-} O H

C H_{3} C O O^{-}

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H_{2} O, ¯ O H, C H_{3} C O ¯ O, P h - O^{-}

(N H_{2}^{-}, C H_{3} C O O^{-}, O H^{-})

(N H_{2}^{-}, C H_{3} C O O^{-}, O H^{-})

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