D-Erythrose is drawn with CHO at the top, $CH X_{2} OH$ at the bottom, and OH on the right at both C2 and C3. D-Threose has OH on the left at C2 and on the right at C3. D-Erythrose and D-threose are:

Aanomers
Benantiomers
Cidentical
Ddiastereomers (C2 epimers)

Answer: D

Both have the same constitution and both are D-sugars, but they differ in configuration only at C2. Epimers are diastereomers that differ at one stereocentre. They are not mirror images, because the mirror image of D-erythrose would be L-erythrose with both OH on the left.

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D-Erythrose is drawn with CHO at the top, CHX2​OH at the bottom, and OH on the right at both C2 and C3. D-Threose has OH on the left at C2 and on the right at C3. D-Erythrose and D-threose are:

Answer: D

More questions on Fischer, Newman and sawhorse projections

D-Erythrose is drawn with CHO at the top, $CH X_{2} OH$ at the bottom, and OH on the right at both C2 and C3. D-Threose has OH on the left at C2 and on the right at C3. D-Erythrose and D-threose are: