Which of the following is the correct or...

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

A

`R-CH_(2)-X gt R_(3)CX gt R_(2)CHX`

B

`R-CH_(2)X gt R_(2)CHX gt R_(3)CX`

C

`R_(3)CX gt R_(2)CHX gt R-CH_(2)X`

D

`R_(2)CHX gt R_(3)CX gt R-CH_(2)X`

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The correct Answer is:

B

Reactivity of R-X in `SN^(2)=1^(@) gt 2^(@) gt 3^(@)`

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