Mechanism of bimolecular (SN2) nucleophilic substitution [Mechanism & Kinetics]
2 reaction proceeds with complete stereo chemical inversion.
2 reaction decreases with stearic hinderance and increases by presence of nonprotic solvent for example DMF and DMSO. SN
2 reaction decreases in the presence of protic solvent like CH3
OH, HF etc.
As the size of alkyl group increases than chemical reactivity towards SN
As the size of alkyl group increases sterichindrance comes into play so reactivity decreases.