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Two compounds with the exact same connectivity, that are mirror images of each other but that are not identical to each other are called enantiomers. The more common definition of an enantiomer is that it is not superimposable on its mirror image.
What is an Enantiomer? Enantiomers are a pair of molecules that exist in two forms that are mirror images of one another but cannot be superimposed one upon the other. Enantiomers are in every other respect chemically identical.
Enantiomers are molecules that have the same molecular formula and connectivity of atoms but differ in their spatial arrangement. More precisely, enantiomers are mirror-image isomers of each other, just like our left and right hands are mirror images of one another. This concept of mirror symmetry is essential for enantiomers.
In chemistry, an enantiomer (/ɪˈnænti.əmər, ɛ-, -oʊ-/ [1] ih-NAN-tee-ə-mər; from Ancient Greek ἐναντίος (enantíos) 'opposite', and μέρος (méros) 'part') – also called optical isomer, [2] antipode, [3] or optical antipode[4] – is one of two stereoisomers that are nonsuperposable onto their own mirror image.
The "right hand" and "left hand" nomenclature is used to name the enantiomers of a chiral compound. The stereocenters are labeled as R or S. Consider the first picture: a curved arrow is drawn from the highest priority (1) substituent to the lowest priority (4) substituent.
Enantiomer, either of a pair of objects related to each other as mirror images that cannot be reoriented so as to appear identical. Molecular enantiomers have identical chemical properties, except in their chemical reaction with other dissymmetric molecules and with polarized light.
Enantiomers are stereoisomers that are mirror images of each other. eg. 1: 1 and 2 have the same molecular formula and the same structural formula and, therefore, are stereoisomers. 1 and 2 are mirror images of each other. Thus, they are enantiomers.
A molecule that is not identical to its mirror image is a kind of stereoisomer (Section 4.2) called an enantiomer (e- nan -tee-oh-mer, from the Greek enantio, meaning “opposite”).
Enantiomers are types of stereoisomers since all the atoms are connected the same but they have a different 3D orientation. Here is a little scheme as a reminder about constitutional isomers and stereoisomers. It also mentions the diastereomers, but you can ignore those for now if you have not covered them in your class:
The meaning of ENANTIOMER is either of a pair of chemical compounds whose molecular structures have a nonsuperimposable mirror-image relationship to each other.