Which of the following is the correct order of decreasing SN2 reactivity?

Question

Which of the following is the correct order of decreasing S_N2 reactivity?

RCH₂X > R₃CX > R₂CHX

RCH₂X > R₂CHX > R₃CX

R₃CX > R₂CHX > RCH₂X

R₂CHX > R₃CX > RCH₂X

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