Draw the displayed formula of a section of poly(propene) showing three repeat units

To display the formula for a section of poly(propene) showing three repeat units, we can represent the repeat unit of polypropylene, which is derived from propene (propylene) monomers, as follows:

The repeat unit of poly(propene) can be represented by the chemical formula:

\text{-(CH}_2\text{-CH(CH}_3)-}_n

where $n$ indicates the number of repeat units.

For three repeat units, it would look like this:

\text{-(CH}_2\text{-CH(CH}_3)-}_3

In full structural representation, this can be illustrated for three units as:

\text{HOCH}_2\text{-C(CH}_3)\text{H-(CH}_2\text{-C(CH}_3)\text{H-(CH}_2\text{-C(CH}_3)\text{H})}_3

To illustrate it simply, it can be depicted as:

  H   H   H
  |   |   |
--C---C---C--
  |   |   |
  H   CH3  H
  |   |   |
  H   H   H

This representation shows a section of the poly(propene) polymer consisting of three repeat units of the propene monomer.