SN2 vs. E2 vs. SN1 vs. E1

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Does substrate have good leaving group?

No
No Rxn
Yes
Is the nucleophile/base strong?
No
Nature of Substrate
Yes
Nuclophile or base?
1o
No Rxn
2o
SN1/E1
3o
SN1/E1
Nucleophile
Nature of substrate?
base
Nature of substrate?
1o
SN2
2o
SN2/SN1
Nature of solvent?
3o
SN1
1o
SN2
2o

Is base bulky?
3o
E2
polar protic
SN1 favored
polar, aprotic
SN2 favored
Yes
E2
No
SN2/E2