Interpretation: The representation of isotactic, syndiotactic and atactic polyacrylonitrile has to be drawn using the monomer given in the problem question.
Polymers are macromolecules which are formed a by number of repeating units called monomers. Based on the techniques involved in preparation of polymers, it can be classified as addition polymer and condensation polymer.
The monomers in main chain of polymer can be oriented in orderly or disorderly manner. Tacticity refers to the stereoregularity in arrangement of repeating monomeric units in the polymer backbone. Tacticity is of following types,
Isotactic – Side groups/functional groups present on the same side of backbone
Syndiotactic - Side groups/functional groups present in alternate manner in the backbone
Atactic - Side groups/functional groups are present in random manner in the backbone