SN1 Reactions: They are substitution nucleophilic unimolecular reactions in which the rate of the reaction depends on the concentration of only one reactant. Product formation takes place by the formation of carbo cation as reaction intermediate. For example:
SN2 reactions they are substitution nucleophilic bimolecular reactions in which rate of the reaction depends on the concentration of two reactants. For example:
The product formation takes place by formation of transition state.
