Question

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

• A. optical rotation and is drived from D - glucose
• B. pH in organic solvent
• C. optical rotation and is derived from D - (+) - glyceraldehyde
• D. optical rotation when substituted by deuterium

Answer 1

Answer: (C)

D-ward is used to represent the arrangement of $OH$ group in right side at second last carbon atoms as in glyceraldehyde and $[+)$ sing is used to represent the rotation in right side. Hence, in $D-(=)-$ trataric acid it has a positive optical rotation and it is derived from glyceralde hyde.