The difference between Enantiomer and Optical isomer
When used as nouns, enantiomer means one of a pair of stereoisomers that is the mirror image of the other, but may not be superimposed on this other stereoisomer. almost always, a pair of enantiomers contain at least one chiral center, and a sample of either enantiomer will be optically active, whereas optical isomer means any one of a number of compounds that exhibit optical isomerism.
check bellow for the other definitions of Enantiomer and Optical isomer
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Enantiomer as a noun (chemistry):
One of a pair of stereoisomers that is the mirror image of the other, but may not be superimposed on this other stereoisomer. Almost always, a pair of enantiomers contain at least one chiral center, and a sample of either enantiomer will be optically active.
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Optical isomer as a noun (chemistry):
Any one of a number of compounds that exhibit optical isomerism.