Give the order of `SN^(-1)` of `SN^(-1)` and `SN^(2)` displacement of halogen `CH_(3)X, 1^(@X, 2^(@)X, 3^(@)X`.

Explanation

`SN^(1) implies 3^(@) gt 2^(@) gt 1^(@) gt CH_(3)X`
`SN^(2) implies CH_(3)X 1^(@) gt 2^(@) gt 3^(@)`