KI in acetone, undergoes $S_{N} 2$ reaction with each P,Q,R and S. The rates of the reaction vary as

P > Q > R > S

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S > P > R > Q

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P > R > Q > S

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R > P > S > Q

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Solution

The correct option is B S > P > R > Q
Acetone is an aprotic solvent and can dissolve both the nucleophile and the substrate and thus $S_{N} 2$ reaction is favoured.
Also

Thus, reactivity order is S > P > R > Q

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KI in acetone, undergoes $S n_{1}$ reaction with each of P, Q, R and S. The rates of the reaction vary as:

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