Question

Difference between erythrose and threose?

Answer 1

Stereoisomers that are not mirror images are called diastereomers. So each erythrose is a diastereomer of both threose isomers. The aldotetroses then fall into two pairs of sugars, erythrose and threose, with different physical properties. Each of these sugars exists as enantiomers (+)-erythrose and (-)-erythrose, (+)-threose and (-)-threose.

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