GChemPaint - Spoken Tutorials - Assignments Funded by the National Mission on Education through ICT ----------------------------------------------------------------------------------------------------- Assignment 1 -------------- Draw Ethane and Pentane structures. Replace one carbon atom of Ethane with Br. Replace the terminal carbon atoms of Pentane with I. Assignment 2 -------------- Draw Octane structure . Add Propyl and Butyl groups at the fourth and fifth positions of the chain.