The leaving group characteristics are also important in determining
if a reaction will occur or not as the group
must develop a partial
negative charge in the TS for both SN1 & SN2
reactions.
reactivity
as a function of leaving group highlow
I-> Br-> Cl->>F-> CH3COO-> OH-> CH3O-> NH2-
stability of anion
In this series F-through to NH2-rarely work
as leaving groups.