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Which of the following haloalkanes react...

Which of the following haloalkanes reacts with aqueous KOH most easily ? Explain giving reason.
(i). 1-Bromobutane
(ii) 2-Bromobutane
(iii) 2-Bromo-2-methylpropane
(iv). 2-Chlorobutane.

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(iii) the compound is a tertiary alkyl halide. It reacts with aqueous KOH most easily. The reaction proceeds by `S_(N^(1))` mechanism. The tertiary carbocation formed in the slow or rate determining step is maximum stable.
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