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Which would undergo S(N^(2)) reaction fa...

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

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`CH_(3)-CH_(2)-Br` because it is a primary alkyl halide and offers less steric hindrance to the attacking nucleophile as compared to the other alkyl halide which is of tertiary nature.
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