SN2 and E2 SN2 H Nuc H Nuc R R Br R Br R E2 RI B-H Br R R Br rate =k[R-Br][B-] SN2 and E2 C C Br H R2 R1 R1 R2 H C Nuc C Nuc: + Br R1 R2 H C Br C C C R2 B: R1 + B-H + Br rate = k[R-Br][B -] SN2 E2