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
2o
3o
1o
2o

3o