Question

the structures below are ______. structural isomers cis - trans isomers conformational isomers not isomers

Explanation:

These structures have same connectivity but different spatial arrangements due to rotation about single - bonds, which defines conformational isomers. Structural isomers have different connectivity, and cis - trans isomers require a double - bond or a ring with restricted rotation for the definition.

Answer:

conformational isomers