Which of the following is the correct order of decreasing `S_(N^(2))` reactivity ?

Which of the following is the correct order of decreasing `S_(N^(2))` reactivity ?
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Which of the following is the correct order of decreasing `S_(N^(2))` reactivity ? A. `R_(2)CHXgtR_(3) ... 3)CXgtR_(2)CHXgtRCH_(2)X("X is a halogen")`
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