In which of the following compounds will react faster in $S N^{2}$ reaction with aqueous $O H^{-} . (C H_{3})_{3} B r$ or $C H_{3} B r$

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Solution

For ${S N}^{2}$ reaction, the compound should not be bulky. So primary carbon has more reactivity towards ${S N}^{2}$ compared to teritary carbon. So, ${C H}_{3} - B r$ reacts faster than ${({C H}_{3})}_{3} B r$ towards ${S N}^{2}$ .

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