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Alkyl halide from the pair would react m...

Alkyl halide from the pair would react more rapidly by an `S_(N) 2` mechanism ? Explain your answer .
`CH_(3)CH_(2) CH_(2) CH_2 Br or CH_(3) CH_(2) underset(Br)underset(|)(C)HCH_(3)`

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(i) `CH_(3)CH_(2)CH_(2)CH_(2)Br" "`Being primary halide, there won’t be any steric hinderance.
(ii) `CH_(3)CH_(2)underset(Br)underset(|)CHCH_(3)" "`Secondary halide reacts faster than tertiary halide.
(iii) `CH_(3)underset(CH_(3))underset("| ")"CH"CH_(2)CH_(2)Br" "`The presence of methyl group closer to the halide group will increase the steric hinderance and decrease the rate
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