If the side groups of a polymer chain are generally on the same side of the polymer backbone, the polymer is called ________.

A) atactic
B) syndiotactic
C) transiotactic
D) cisisotactic
E) isotactic

When the side groups of a polymer chain are generally on the same side of the polymer backbone, the polymer is called isotactic. This arrangement results in a regular and ordered packing of the polymer chains, leading to increased crystallinity and improved mechanical properties. Atactic polymers have randomly placed side groups, while syndiotactic polymers have alternating placement of side groups. Transiotactic and cisisotactic are not valid terms in polymer chemistry.