How many total, distinct "meso" isomers exist for the molecular formula corresponding to classical t — Isomerism and Stereochemistry Chemistry Question

💡 Solution & Explanation

Tartaric acid is a highly symmetrical molecule containing an even number ($n=2$) of structurally identical chiral centers. Because the structural terminal ends are identical, it generates exactly one enantiomeric pair (the optically active d-tartaric acid and l-tartaric acid) and exactly one optically inactive "meso" form, which is rendered achiral by a distinct internal Plane of Symmetry (POS).