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The order of reactivities of the following alkyl halides for a ${S_{N}}^{2}$ reaction is

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RF > RCl > RBr >RI

RI > RBr > RCl > RF

RCl > RBr > RF > RI

RF > RBr > RCl>RI

answer is D.

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Detailed Solution

$R I > R B r > R C l > R F$

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