If the alcoholic group is present on the left side of the last chiral carbon then it is D− sugar and if it is on the left side then it is L− sugar.
All the four given molecules with their names are given below. 
NEET UG 2016 — Chemistry Organic Chemistry
2016mcqmedium
The correct corresponding order of names of four aldoses with configuration given below respectively, is
Official previous-year question
Held on 30 Apr 2016 · Verified 9 Jul 2026.
Options
- A
L−erythrose, L−threose, L−erythrose, D−threose.
- B
D−threose, D−erythrose, L−threose, L−erythrose.
- C
L−erythrose, L−threose, D−erythrose, D−threose.
- D
D−erythrose, D−threose, L−erythrose, L−threose.
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