Isomerism and StereochemistryhardMCQ MULTIPLE

Which of the following analytical statements accurately correlate the historical D/L relative configIsomerism and Stereochemistry Chemistry Question

Question

Which of the following analytical statements accurately correlate the historical D/L relative configuration system with the modern IUPAC R/S absolute configuration system?

Answer: A,C

💡 Solution & Explanation

D-(+)-Glyceraldehyde is explicitly 2R-2,3-dihydroxypropanal. Thus, the standard D-glyceraldehyde corresponds to 'R'. Most natural L-amino acids are 'S' (except Cysteine, which is 'R' due to the sulfur atom altering CIP priorities). There is absolutely no global, universal correlation dictating that all 'D' molecules are 'R' (B is false), and there is zero correlation between optical rotation direction (+/-) and absolute configuration (D is false).

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