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Grade: 12th pass

                        

please explain sn1 and sn2

5 years ago

Answers : (2)

Aarti Gupta
askIITians Faculty
300 Points
							Nucleophilic substitution reactions are of two types according to the mechanisms they follow--
SN1 reaction – SN1 reaction is reffered to as substitution nucleophilic unimolecular reaction.In such reaction only one molecule is involved in rate determinig step and it is written as SN1.It is found that such type of reactions are generally carried out in polar protic solvents like H2O,alcohol,acetic acid etc.
For ex- reaction between ter-butyl bromide and OH- to form tert-butyl alcohol follows such type of reaction.
(CH3)3C--Br + OH-- ---------->. (CH3)3C--OH + Br--
The rate of above reaction can be expressed as--
Rate = k[(CH3)3C-Br]
Since concentration of only one of the reactant involves in rate determination i.e one molecule is involved in determining the rate of raection,so it is SN1 reaction.
SN2 reaction– This is reffered to as substitution nucleophilic bimolecular because two molecules participate in determining the rate of the reaction.
For ex- reaction between methyl bromide and OH- to form methanol.
CH3Br + OH- ------------> CH2OH + Br--
Rate of the reaction is expressed as--
Rate = k[CH3Br][OH-]
Since rate depends on the concentrations of both the reactants i.e two molecules are involved so it follows second order kinetics.
5 years ago
Adarsh
733 Points
							
please check this comparison
5 years ago
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