only slightly. Other pairs (such as CHFClBr) cannot be interconverted without breaking bonds, and therefore are different configurations.

Diastereomers

Stereoisomers that are not enantiomers are called diastereomers. Some diastereomers may contain chiral centers, and some may not.

Cis-trans isomerism

A double bond between two carbon atoms forces the remaining four bonds (if they are single) to lie on the same plane, perpendicular to