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Topic: Carbohydrates: classification, glucose, fructose· Biomolecules

The correct corresponding order of names of four aldoses with configuration given below [four Fischer projections] respectively, is

The correct corresponding order of names of four aldoses with configuration given below [four Fischer projections] respectively, is

four Fischer projections of 4-carbon aldoses

1. D-threose, D-erythrose, L-threose, L-erythrose

2. L-erythrose, L-threose, D-erythrose, D-threose

3. D-erythrose, D-threose, L-erythrose, L-threose

4. L-erythrose, L-threose, L-erythrose, D-threose

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Answer: 3. D-erythrose, D-threose, L-erythrose, L-threose

Key idea: D/L is decided by the OH on the lowest chiral carbon (right = D). Erythrose has both OH on the same side; threose has them on opposite sides.

  • 1st: both OH right: D-erythrose.
  • 2nd: top OH left, bottom OH right: D-threose.
  • 3rd: both left: L-erythrose.
  • 4th: top right, bottom left: L-threose.

Order: D-erythrose, D-threose, L-erythrose, L-threose.

Doubtly AI · 30 Oct 2026 AI-generated · not yet verified Report
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