Describe any two differences in substitution nucleophilic bimolecular $(S_{N} 2)$ and substitution nucleophilic unimolecular $(S_{N} 1)$ reaction mechanisms

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Solution

Substitution nucleophilic unimolecular $(S_{N} 1)$
Substitution nucleophilic bimolecular $(S_{N} 2)$
The order of the reaction is one.
The order of reaction is two.
Attack of nucleophile can attack from either side, but back side attack predomiantes.
Attack of nucleophile occurs from backside.
Electronic factors influence reaction rate.
Steric factors influence reaction rate.
Reaction may occur with rearrangement.
Reaction occurs without rearrangement.

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Substitution nucleophilic unimolecular $(S_{N} 1)$	Substitution nucleophilic bimolecular $(S_{N} 2)$
The order of the reaction is one.	The order of reaction is two.
Attack of nucleophile can attack from either side, but back side attack predomiantes.	Attack of nucleophile occurs from backside.
Electronic factors influence reaction rate.	Steric factors influence reaction rate.
Reaction may occur with rearrangement.	Reaction occurs without rearrangement.