Conformational isomerism concerns spatial arrangements interconverted by internal motion, such as turning about a single chemical bond. Moving the entire molecule or applying a rotation changes its position or viewing direction, not its internal arrangement.
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Conformational isomerism, also known as conformers or conformational isomers, refers to the different spatial arrangements of a molecule that can be achieved by rotation around single bonds. Unlike structural isomers, which differ in the connectivity of atoms, conformational isomers differ only in their three-dimensional shapes due to the rotation around single sigma (σ) bonds.