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The order of reactivitiesof the following alkyl halides for a $Sn^2$ reaction is

$ (a)\;RF > RCL > RBr >RI \\ (b)\;RF > RBr > RCl >RI \\ (c)\;RCl > RBr > RF >RI \\ (d)\;RI > RBr > RCl >RF $
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In $R-X$ the rate of reactions follows the order.
$R -I > R-Br > R-Cl > R-F$
$I^-$ is the best leaving group among halide ions.
Hence d is the correct answer.
answered Feb 22, 2014 by meena.p
 

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