Prior to stereoisomer calculation, it is absolutely critical to classify a molecule's symmetry. Whic — Isomerism and Stereochemistry Chemistry Question

💡 Solution & Explanation

An unsymmetrical molecule lacks identical terminal ends and possesses no internal plane or center of symmetry. Molecule A has ends $-CH(OH)CH_3$ and $-CH(Cl)CH_3$ (different). Molecule B has ends $-CH_3$ and $-Cl$ (different). Molecule C (an aldose) has ends $-CH_2OH$ and $-CHO$ (different). Molecule D, however, is symmetrically identical from both ends, making it symmetrical and requiring different formulas.