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Which of the following is the correct or...

Which of the following is the correct order of decreasing `S_N2`2 reactivity' ? (X=a halogen) 

A

` RCH_2 X gt R_2 CHX gt R_3 CX`

B

` R_3 CX gt R_2 CHX gt RCH_2 X `

C

` R_2 CHX gt R_3 CX gt RCH_2X `

D

` RCH_2 X gt R_3 CX gt R_2 CHX`

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The correct Answer is:
A
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