Which alkyl halide from the following pairs would you expect to react more rapidly by an SN2 mechanism? Explain your answer. `(i) CH_(3)CH_(2)CH_(2)CH

Question

Which alkyl halide from the following pairs would you expect to react more rapidly by an SN2 mechanism? Explain your answer. `(i) CH_(3)CH_(2)CH_(2)CH

Which alkyl halide from the following pairs would you expect to react more rapidly by an SN2 mechanism? Explain your answer.
`(i) CH_(3)CH_(2)CH_(2)CH_(2)Br or CH_(3)CH_(2)underset(Br)underset(|)C HCH_(3) , (ii) CH_(3)CH_(2)underset(Br)underset(|)CHCH_(3) or H_(3)C-underset(CH_(3))underset(|) overset(CH_(3))overset(|)C-Br`
(iii)` CH_(3)underset(CH_(3))underset(|)CHCH_(2)CH_(2)Br or CH_(3)CH_(2)underset(CH_(3))underset(|)CHCH_(2)Br`

Monjur Alahi

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2025-01-04 04:42

1 Answers

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Salim Ahmed Kawsar · Accepted Answer · 2023-02-05T15:29:48+06:00

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