(Do these questions on your own paper to turn in. You do not need to write the question)

2. What is the molecular formula for an alkane with 12 carbon atoms?

8. Draw a structure for cycloheptane. Is the seven-member ring planar? Explain your answer.

18. Draw structural formulas for the following compounds:

     (a) m-dichlorobenzene (alternatively called 1,3-dichlorobenzene)

     (b) p-bromotoluene (alternatively called 1-bromo-4 methylbenzene)

24. Give formulas and structures of the following amines:

     (a) ethylamine

     (b) dipropylamine

     (c) butyldimethylamine

26. Draw structural formulas for all the alcohols with the formula C₄H₁₀O. Give the systematic name of each.

42. Saran is a copolymer of 1,1-dichloroethene and chloroethene (vinyl chloride). Draw a possible structure for this polymer.

44. Draw the structure of each of the following compounds:

     (a) 2,2-dimethylpentane

     (b) 3,3-diethylpentane

     (c) 2-methyl-3-ethylpentane

     (d) 3-propylhexane

61. Plastics make up about 20% of the volume of landfills. There is, therefore, considerable interest in reusing or recycling these materials. To identify common plastics, a set of universal symbols is now used.  They symbolize low- and high-density polyethylene, polyvinyl chloride, polypropylene, and polyethylene terephthalate.

     (a) Tell which symbol belongs to which type of plastic (using the symbols on page 535)

     (b) Find an item in your house made from each of these plastics. List all of the items, and bring one in to share with the class on
          Friday.