$K I$ in acetone undergoes $S_{N} 2$ reaction with each of 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
Relative reactivity for $S_{N} 2$ reaction in the given structure is

Substrate (S) $C H_{3} C l$
(P) $H_{2} C = C H - C H_{2} C l$
(R) (Q)

Relative Rates Towards $S_{N} 2$ 100000 200 79 0.02

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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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Substrate	(S)	$C H_{3} C l$ (P)	$H_{2} C = C H - C H_{2} C l$ (R)	(Q)
Relative Rates Towards $S_{N} 2$	100000	200	79	0.02