Which of the following pairs are C-2 epimers as well as enantiomers?

D-Glyceraldehyde and L-Glyceraldehyde

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D-Erythrose and D-Threose

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D-Ribose and D-Arabinose

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D-Xylose and D-Lyxose

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Solution

The correct option is A D-Glyceraldehyde and L-Glyceraldehyde
$D - G l y c e r a l d e h y d e$ and $L - G l y c e r a l d e h y d e$ are $C - 2$ epimers as well as enantiomers.
They are epimers as they differ in a configuration only at one stereocenter.
They are enantiomers because, they are non-superimposable mirror images of each other.

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