Q.Write the structure of monomer from which each of the following polymers are obtained.
a. Teflon (-CF2-CF2-)n
b. Polypropene
c. Polyvinyl chloride

Step 1. Recall the polymerization idea. Section 15.2.4 defines a monomer as the small repeating-unit compound from which a large-chain polymer is built by joining many monomer molecules together, exactly as ethene polymerises to polyethene.

Step 2. Teflon. The formula given, -(CF2-CF2)-n, shows the repeating unit is a 2-carbon fragment carrying 4 fluorines; the monomer that would polymerise to give exactly this repeating unit is tetrafluoroethene, CF2=CF2 (each monomer's double bond opens up to link to the next unit).

Step 3. Polypropene. The repeating unit of polypropene carries a methyl branch on alternate carbons, matching a 3-carbon monomer with a double bond; that monomer is propene, CH2=CH-CH3. …

Matching each polymer's repeating structural unit back to the small alkene monomer whose double bond, on open …

• Writing the SATURATED analogue (e.g. tetrafluoroethane instead of tetrafluoroethene) instead of the alkene monomer -- a monomer for addition polymerization must retain the double bond before polymerization. …