Which of the following pair of compounds which will react faster in $S_{N} 2$ reaction with $(C H_{3})_{3} C - B r$ or $C H_{3} B r$ ?

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Solution

${({C H}_{3})}_{3} C B r$ is less reactive than ${C H}_{3} B r$ because it is more bulkier which makes the attack of Nucleophile very difficuit.
So, ${C H}_{3} B r$ is more reactive to ${S N}^{2}$ .

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