# Which one is the most common reaction in organic chemistry: SN1, SN2, E1 or E2?

For nucleophilic substitutions, SN1 and SN2 are equally important, however, for $\beta$-elimination, E2 is much more common and useful than E1.
For nucleophilic substitutions, SN1 and SN2 are equally important, however, for the $\beta$-elimination, E2 is much more common and useful than E1.