Which of the following is the correct order of decreasing $S_{N^{2}}$ reactivity?
($X$ is a halogen)
($X$ is a halogen)
- A$R_2CHX > R_3CX > RCH_2X$
- B$RCH_2X > R_3CX > R_2CHX$
- C$RCH_2X > R_2CHX > R_3CX$
- D$R_3CX > R_2CHX > RCH_2X$
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