The $S_{N} 1$ reaction cannot be carried out in which of the following media?

Acetic acid

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Acetone

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Ethanol

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Water

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Solution

The correct option is B Acetone
$S_{N} 1$ reactions are carried out in polar protic solvents like water, alchohol and acetic acid.These solvents promote the ionisation step by stabilising the ions by solvation.
$S_{N} 2$ reactions are carried out in polar aprotic solvents like acetone.

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