S & E Flowchart

Decision Tree

Primary with Fast Nucleophile

SN2 if weak base

SN2 if strong base with E2 as minor pathway

Primary with Slow Nucleophile

E2 if strong base

No reaction if weak base

Secondary with Fast Nucleophile

E2 if strong base with SN2 as minor pathway

SN2 if weak base

Secondary with Slow Nucleophile

E2 if strong base

E1 if weak base, polar protic, with heat

SN1 if weak base, polar protic, with no heat

Tertiary with Fast Nucleophile

E2 if strong base

SN1 if weak base with polar protic

Tertiary with Slow Nucleophile

E2 if strong base

E1 if weak base with heat

SN1 if weak base and no heat

Tertiary Substrate

E1 & E2 & SN1

Secondary Substrate

E1 & E2 & SN1 & SN2

Primary Substrate

E2 & SN2

Methyl Substrate

SN2