Dear Bro, thanks a lot for kind response. I had used 60 ml of 4-Methylpropiophenone mixed with 46 ml of HBr (48 %). took 26 ml of H2O2 (35 %) and added drop wise. However, RM color remained red after adding about 15 ml of H2O2. Even then I had added the rest of per oxide. During initial addition of H2O2,temp. of RM raised too high that made hard to touch the flask, then it was controlled by putting ice cooled water around the flask. after some time, white fluffy solid formed and whole RM was allowed to rest whole night. next morning, green liquid (about 40 ml) was found with the solid product and this liquid was resting at bottom, means it was not soluble in aqueous solution. hopping this info will serve the purpose.