Rate of reaction -The reaction are one step reaction in which bond formation with nucleophile and bond breaking with leaving group done at same time. Thus, the rate of reaction is bimolecular.
Strong nucleophile and Weak leaving group- A strong nucleophile and weaker leaving group is in the reaction that form bond with substrate and weakens the bond of leaving group.
Less hindered substrate- The substrate is less hindered for the formation of transition state between strong nucleophile, substrate and leaving group. There is no intermediate formation in reaction.
Polar aprotic solvent- The reaction has polar aprotic solvent like DMSO,DMF that dissolve substrate and nucleophile but do not form any bonding with nucleophile.