In a $S_{N} 2$ substitution reaction of the type
$R - B r + C l^{-} D M F ⟶ R - C l + B R^{-}$

Which of the following has the highest relative rate ?

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C H_{3} C H_{2} B r

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Solution

The correct option is B $C H_{3} C H_{2} B r$
The given reaction is $S_{N} 2$ reaction.

More the bulky substituents present around the carbon, more difficulty for the nucleophile to approach the carbon having leaving group. therefore the order of reactivity for alkyl halides is :
$Methyl >Primary>Secondary>Tertiary$

So, $C H_{3} C H_{2} B r$ has the highest relative rate.

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