How can we identify which one undergoes faster reaction in SN1 or SN2 reaction when they give two secondary compounds??

Open in App

Solution

Conditions for faster reactions in SN1 and SN2 mechanisms:

SN1 (Faster) SN2 (Faster)
1.Reagent should be weak base 1.Reagent should be strong base
2.Carbon connected to the leaving group should be tertiary (may be secondary) so that the carbocation will be stable after removal of group. 2.The carbon connected to the leaving group should be a primary or a methyl group (may be secondary sometimes)
3.The solvent used should be polar protic solvent as (water, alcohol etc.) 3. The solvent should be polar aprotic as (DMF,DMSO etc.)
4. These are generally bulky groups. 4.Molecules must not be bulky because it has to enter in the compound by removing the leaving group.

SN1 (Faster)	SN2 (Faster)
1.Reagent should be weak base	1.Reagent should be strong base
2.Carbon connected to the leaving group should be tertiary (may be secondary) so that the carbocation will be stable after removal of group.	2.The carbon connected to the leaving group should be a primary or a methyl group (may be secondary sometimes)
3.The solvent used should be polar protic solvent as (water, alcohol etc.)	3. The solvent should be polar aprotic as (DMF,DMSO etc.)
4. These are generally bulky groups.	4.Molecules must not be bulky because it has to enter in the compound by removing the leaving group.