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

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The optically active tartaric acid is named as `D-(+)-` tartaric acid because it has a positive
A. Optical rotation and is derived from `D`-glucose.
B. `pH` in organic solvent.
C. Optical rotation and is derived from `D-(+)-` glyceral-dehyde.
D. Optical rotation when substituted by deuterium.
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Correct Answer - C
The symbol `D` denotes the relative configuration of `(OH)` group `w.r.t`. glyceraldehyde taken as standard.
Also , `(+)` sign refers to optical rotation and is dextro-rotatory.
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