L-threose and D-threose

Study for the Manor Preboards Module 2 Test. Use flashcards and multiple choice questions that include hints and explanations. Prepare thoroughly for your exam!

Multiple Choice

L-threose and D-threose

Explanation:
The concept here is how L- and D- forms relate in small sugars. L and D indicate opposite configurations at the stereocenters when you draw the open-chain form (or use the Fischer convention tied to glyceraldehyde). When two forms are non-superimposable mirror images, they are enantiomers. Threose has two stereocenters, so there are four possible stereoisomers. The pair that has opposite configurations at both stereocenters—L-threose and D-threose—are mirror images of each other. That makes them enantiomers. They are not anomers (which would be different forms at the anomeric carbon in cyclic forms), and they are not epimers (which would differ at exactly one stereocenter). So L-threose and D-threose being enantiomers is the best description of their relationship.

The concept here is how L- and D- forms relate in small sugars. L and D indicate opposite configurations at the stereocenters when you draw the open-chain form (or use the Fischer convention tied to glyceraldehyde). When two forms are non-superimposable mirror images, they are enantiomers.

Threose has two stereocenters, so there are four possible stereoisomers. The pair that has opposite configurations at both stereocenters—L-threose and D-threose—are mirror images of each other. That makes them enantiomers. They are not anomers (which would be different forms at the anomeric carbon in cyclic forms), and they are not epimers (which would differ at exactly one stereocenter). So L-threose and D-threose being enantiomers is the best description of their relationship.

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