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what are SN2 and SN1 reactions. plz explain in simple terms..

what are SN2 and SN1 reactions. plz explain in simple terms..

Grade:12

2 Answers

Vikas TU
14149 Points
6 years ago
SN1 Reactions:
PPS must be present .i.e polar protic solvent and always stable carbocation will be formed .i.e 
Do Reaarangement in stable form of carbocation.
---> Unimolecular 2 step reacn.
---> Rate is directly proportional to stability of carbocation
---> rate is directly prpportional to [R-X]
---> inversely prop. to Eactivation.
 
SN2 Reacn. :
only for 1 degree and 2 degree.
---> C=C-X and  CtriplebondC-X will never give SN2 they r exception.
Remember.
---> Biomolecular one step reacn.
---> diectly proprtional to delta positive charge on carbon
and inevrsely proprtional to steric crowding.
Umakant biswal
5359 Points
6 years ago
@ saharukh 
Sn1 stands for substitution nucleophilic unimolecular and Sn2 stands for substitution nucleophilic bimolecular . 
below are the charecteristics of Sn1 reaction 
1- it follows first order kinetics . 
2- the process completes in two steps 
step 1 – formation of carbocation and in step 2 the nucleophilic will attack on the carbocation to form the product 
in Sn1 reaction racemisation occurs beacuse of equal chances in front and backside attack . 
SN2 REACTION 
1- this reaction obeys second order kinetics 
2- this reaction completes in 1 step 
3- in this reaction type the inversion of configuration takes place . 
HOPE IT CLEARS YOUR DOUBT 
ALL THE BEST ..

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