Question

The order of reactivities of the following alky halides for an `S_(N)2` reaction is .
A. `RF gt RCl gt RBr gt RI`
B. `RF gt RBr gt RCI gt RI`
C. `RCl gt RBr gt RF gt RI`
D. `RI gt RBr gt RCI gt RF`

Answer 1

Correct Answer - `d`
The order of reactivity of allkyl halides in `SN^(1)` or `SN^(2)` reaction is:
`(R-1) gt (R-Br) gt (R-Cl) gt (R-F)`
`I^(theta)` is a better nucelphilic and a better leaving group. Leaving group order. `I^(theta) gt Br^(theta) gt Cl^(theta) gt F^(theta)`