KI in acetone, undergoes $S n_{1}$ 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

Some of the fastest $S n_{1}$ is given by α-chlorinated carbonyl compounds. The rate of reaction depends upon the stability of carbocation formed after breaking of C-Cl bond. Among all the carbocations formed, S will be the most stable as the positive charge on carbon will be resonance stabilized by carbonyl group.

Rate of reaction will be: S > P > R > Q

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\begin{matrix} C o l u m n - I (I d e a l G a s) & Column - II (Related equation) (A) Reversible isothermal process & (P) W = 2.303 n R T l o g (P_{2} / P_{1}) (B) Reversible adiabatic process & (Q) W = n C_{v, m} (T_{2} - T_{1}) (C) Irreversible adiabatic process & (R) P V = n R T (D) Irreversible isothermal process & (S) W = - \int_{v_{i}}^{v_{f}} P_{e x t .} d V \end{matrix}

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