Stereoisomers: isomers that have same formula and connectivity but differ in the position of the atoms in space. They possess one or more stereocenters.
Stereocenter: a carbon atom bearing 4 different atoms or group of atoms.
Chiral: any molecule that is nonsuperposable with its mirror image.
Enantiomers: stereoisomers that are non superposable mirror images.
Racemic mixture: a 1:1 (equimolar) mixture of two enantiomers.
Optically Active: the ability of some compounds to rotate plane polarized light.
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