need the answer for the following

Communication Section (12 marks total) Sketching: Answer each question by drawing in the space provided. (12 marks total; 3 marks each) 17. There are many different ways to visually represent organic molecules. Demonstrate two different methods of diagramming the structure of 3,4-dimethyl-4-ethylheptane. Name each type of 2D model. (a) (b) Model Type: Model Type: 18. Demonstrate two different isomers of the acyclic alkene with the formula C.H. After you have drawn them, write the IUPAC name of each structure. (a) (b) Name: Name: 19. Demonstrate two different isomers of the cyclic alkane with the formula C.H.Br. After you have drawn them, write the IUPAC name of each structure. (a) (b) Name: Name: 20. How do amines and an amides compare? Draw a three-carbon amine and a three-carbon amide to show the differences and similarities in these two classes of organic compounds. After you have drawn them, write the IUPAC name of each structure. (a) (b) Name: Name