Arrange the following in the increasing order of their ability as a leaving group: $C F_{3} S O_{3}^{-}, C H_{3} S O_{3}^{-} a n d C H_{3} C O O^{-}$

C H_{3} S O_{3}^{-}

C F_{3} S O_{3}^{-}

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

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C F_{3} S O_{3}^{-}

C H_{3} S O_{3}^{-}

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

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C F_{3} S O_{3}^{-}

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

C H_{3} S O_{3}^{-}

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C F_{3} S O_{3}^{-}

C H_{3} S O_{3}^{-}

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

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Solution

The correct option is D $C F_{3} S O_{3}^{-}$ > $C H_{3} S O_{3}^{-}$ > $C H_{3} C O O^{-}$
The increasing order of their ability as a leaving group is $C F_{3} S O_{3}^{-}$ > $C H_{3} S O_{3}^{-}$ > $C H_{3} C O O^{-}$ .
The electronegative $F$ atoms show $- I$ effect and remove the electron density and stabilise the negative charge. Hence, the leaving group ability of $C F_{3} S O_{3}^{-}$ is maximum. Acetate ion has the least ability as a leaving group.

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