PICRIC ACID IS BASICALLY PREPARED FROM PHENOL BY REACTING PHENOL WITH CONCENTRATED SULPHURIC ACID AND CONCENTRATED NITRIC ACID. THE NITRO GROUPS FROM NITRIC ACID ATTACKS ON ORTHO AND PARA POSITIONS WHICH IS THE BEST SUITABLE AND STABLE POSITION FOR THE NEWLY FORMED COMPOUND WHICH IS PICRIC ACID. NO YOU CANT JUST KNOW HOW TO MAKE PICRIC ACID. IT IS UNNACAPTABLE