i find it very difficult to make out whether two compounds are enantiomers, diastreomers or identical. pls help

Dear Varsha

In chemistry, an enantiomer is one of two stereoisomers that are mirror images of each other that are "non-superposable" (not identical), much as one's left and right hands are "the same" but opposite

Diastereomers:diastereoisomers stereoisomers that are not enantiomers.Diastereomerism occurs when two or more stereoisomers of a compound have different configurations at one or more (but not all) of the equivalent (related) stereocenters and are not mirror images of each other

Diastereomers
D-Threose	D-Erythrose

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