All energetically effective collisions do not result in a chemical change. Explain with the help of an example.

(N/A) For the formation of a product in a chemical reaction,molecules must experience a fruitful collision. $A$ fruitful collision is one in which molecules possess:
$(i)$ Sufficient kinetic energy (Threshold energy)
$(ii)$ Proper orientation.
If the molecules have sufficient kinetic energy but lack proper orientation,the product will not form.
Example: In the formation of methanol from bromomethane $(CH_3Br + OH^- \rightarrow CH_3OH + Br^-)$,if the $OH^-$ ion approaches the $CH_3Br$ molecule from the side of the $Br$ atom,repulsion occurs due to similar charges,and no product is formed. However,if the $OH^-$ ion approaches from the opposite side of the $Br$ atom,it collides with the carbon atom (which has a partial positive charge,$+\delta$),leading to the formation of the product. This is represented by the Arrhenius equation: $k = P Z_{AB} e^{-E_a/RT}$,where $P$ is the steric factor (orientation) and $e^{-E_a/RT}$ represents the fraction of molecules with sufficient energy.