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Which would undergo S(N)2 reaction faste...

Which would undergo `S_(N)2` reaction faster in the following pair and why?
`CH_(3)-CH_(2)-Br and CH_(3)-undersetunderset(Br)(|)oversetoverset(CH_(3))(|)(C)-CH_(3)`

Text Solution

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On steric grounds, `1^(@)` alkyl halides are more reactive than tert-alkyl halides in `S_(N)2` reactions.
Thus, `CH_(3)-CH_(2)-Br` reacts at a faster rate than `(CH_(3))_(3)` CBr in `S_(N)2` reactions, because it is a primary halide, i.e. less hindered.
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