Aromaticity concept is given incorrect or incomplete to the student in secondary education and knowledge based on this basic concept has been caused to another misconception in future. How are the achievement levels relating to the comprehension of various characteristics of aromatic compounds for the first and third grade students attending Department of Chemistry in Faculty of Sciences and Arts, and Faculty of Education in Dicle University and eleventh (last) grade secondary students? Sample of this study consists of 140 students from Department of Chemistry in Faculty of Sciences and Arts, and Faculty of Education in Dicle University and 65 students randomly selected from secondary school students in Diyarbakir city center. Data were collected from the achievement test developed for aromaticity concept and features. According to the findings of this study, the average achievement scores difference between the students' relating to cyclic properties, planer structure, conjugated double bond, the reactions of aromatic compounds and aromatic compounds obeying Huckel's Rule has been found significant. It has been seen that the Aromaticity concept was given in a less amount in secondary school chemistry instruction program or even insufficient and misconceived form in some chemistry books by reviewing the last grade of secondary school chemistry text books. The findings of this study showed that the students have had misconceptions about this subject. So, the secondary school instruction program could be reviewed and given place about aromaticity concept on a large scale. (Contains 9 tables.)