Dear Pankaj, .... the plant smells when leaves are crushed.
Google "Chromolaena odorata smell"
... crushed leaves emit pungent odour
... also known as parrafienbos, for the smell. It smells like Parrafin
... Leaves ovate to triangular, 3-veined from the base, gland-dotted below, smelling strongly of turpentine or paraffin when crushed.
Regards.