The optically active tartaric acid is named as D-(+)- tartaric acid because it has a positive (a

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The optically active tartaric acid is named as D-(+)-...

The optically active tartaric acid is named as $\mathrm{D}-(+)-$ tartaric acid because it has a positive (a) optical rotation and is derived from D-glucose (b) $\mathrm{pH}$ in an organic solvent (c) optical rotation and is derived from D-(+)glyceraldehyde (d) optical rotation only when substituted by deuterium

The optically active tartaric acid is named as $\mathrm{D}-(+)-$ tartaric acid because it has a positive
(a) optical rotation and is derived from D-glucose
(b) $\mathrm{pH}$ in an organic solvent
(c) optical rotation and is derived from D-(+)glyceraldehyde
(d) optical rotation only when substituted by deuterium

Key Concepts

Derivation from Glyceraldehyde

The designation of optically active compounds like D-(+)-tartaric acid is historically linked to their derivation from or correlation with D-(+)-glyceraldehyde. This connection helps in establishing a consistent naming convention where the optical rotation and underlying stereochemical configuration are referenced back to a common, well-defined chiral molecule.

D/L Nomenclature

The D/L nomenclature system assigns absolute configurations to chiral molecules based on their relation to the configuration of glyceraldehyde. In this system, a compound is designated as D or L by comparing the configuration of its stereocenters to that of D-(+)-glyceraldehyde, establishing a standard reference for determining absolute configuration.

Optical Activity

Optical activity is the ability of a chiral substance to rotate the plane of polarized light. This rotation, measured using a polarimeter, indicates the presence of an asymmetric (chiral) structure and is a key physical property used to characterize and distinguish enantiomers.

Chirality and Enantiomerism

Chirality refers to the geometric property of a molecule that makes it non-superimposable on its mirror image. Molecules exhibiting chirality exist as enantiomers, which are pairs of stereoisomers that can rotate polarized light in opposite directions, even though they possess identical physical and chemical properties in an achiral environment.

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