CBSE Class 12-science Answered
Why nucleophilic substitution reaction do not take place in aryl halide and alkyl halide
There is an interaction between one of the lone pairs on the halogen atom and the π electrons of the ring, and this strengthens the bond.
So it is difficult to break the bond.
The electron-withdrawing polar effect of the ring double bonds destabilises an aryl cation.
They require very high energy for the formation of carbocation intermediate -aryl cation.
Thus making SN1 reactions impossible.