Nucleophilic substitution reactions...

A chemical reaction is said to Nucleophilic type if the attack of a positive charge loving specie takes place over it.
There are generally two types of reactions for this category ;
● SN1 reaction
● SN2 reaction
#SN1》a reaction is said to be SN1 type if it does involves the nucleophilic substitution by unimolecular type. In SN1 reactions the generation of carbocation takes place in the very first step then the attack of nucleophile takes place.
They involves the complete retention of symmetry. Although inversion of symmetry also occur but the major product is always with the retention of symmetry...
It involves the presence of Base in the first step. The order of reactivity is 3°>2°1° since the carbocation generation occur.
#SN2 》a reaction is said to be of SN2 type if it does involves the nucleophilic substitution of bimolecular type. This reaction is of 1 step only since the attack of nucleophile as well as the removal of leaving group takes place in the same step which is why the step is called as #concreted step and after that the new substituted product obtained is of inverted symmetry.
The inversion of symmetry takes place in SN2 type of reactions and moreover the reactions doesn't involve the carbocation generation therefore they do require strong Base.
The order of reactivity is 1°>2°>3° back attack of nucleophile occur...
More information carefully study the mechanism given in image below👇👇

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