The kinetics of the reaction between different 2-acetyl benzofuran (BF) and phenyltrimethylammonium tribromide (PTT) has been studied spectrophotometrically in acetic acid under varying conditions. The results indicate first order kinetic with respect to 2-acetyl benzofurans (BF) and inverse first order due to phenyltrimethylammonium tribromide (PTT). Effect of ionic strength and dielectric constant on reaction rate was observed. The rates of reaction are measured at different temperature and activation parameters have been calculated. The products of the bromination are the corresponding 2-bromoacetyl benzofurans.