What is the order of reactivity for the $S_{N}2$ reaction among the following alkyl halides?

  • A
    $RF < RCl < RBr < RI$
  • B
    $RF > RBr > RCl > RI$
  • C
    $RCl > RBr > RF > RI$
  • D
    $RI > RBr > RCl > RF$

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