Which of the following haloalkanes will under | vedclass

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(A) The rate of $S_{N}2$ reaction depends primarily on steric hindrance. Less sterically hindered alkyl halides react faster.$(I)$ is $1$-iodopentane

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$(I)$

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(A) The rate of $S_{N}2$ reaction depends primarily on steric hindrance. Less sterically hindered alkyl halides react faster.$(I)$ is $1$-iodopentane (primary alkyl halide).$(II)$ is $1$-chloropentane (primary alkyl halide).$(III)$ is chlorocyclohexane (secondary alkyl halide).$(IV)$ is (chloromethyl)cyclohexane (primary alkyl halide).Between primary alkyl halides,the nature of the leaving group is important. Iodine is a better leaving group than chlorine because it is a weaker base.Therefore,$1$-iodopentane $(I)$ reacts the fastest in an $S_{N}2$ reaction.

Which of the following haloalkanes will undergo $S_{N}2$ reaction at the fastest rate?

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