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, alcohol and acetic acid. These solvents promote the ionisation step by stabilising the ions by solvation. Thus acetone cannot be used because it is a non-polar solvent.

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