How many of the following elimination takes place via E1CB

Last updated: 6/28/2023

How many of the following elimination takes place via E1CB mechanism Br OH H C CH CH C CH3OH H3C CH CH C CH3 MeO Ph O C H5O A NO 2 H MeO A H3C S CH CH OPh Ph NaOD D 0 A NO 2 01S H C S CH CH