Among the following pair of reactions in which pair second reaction is faster than first for $S_{N} 1$ reaction?

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$(I) M e_{3} C - C l + C H_{3} S H (I I) M e_{3} C - C l + C H_{3} O H$

$(I) M e_{3} C - C l + C H_{3} O H (I I) M e_{3} C - C l + H_{2} O$

$(I) \begin{array}{l} M e_{3} C - C l + H_{2} O \\ (1 M) \end{array} (I I) \begin{array}{l} M e_{3} C - C l + H_{2} O \\ (2 M) \end{array}$

$(I) M e_{3} C - C l + H_{2} O (I I) M e_{3} C - B r + H_{2} O$

answer is A, C.

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Detailed Solution

-Br is better leaving group than –Cl
Dielectric constant of $H_{2} O$ is greater than $C H_{3} O H$ . As conc. Of substrate increase rate of $S_{N} 1$ increases.

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