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 – (+) – glyceraldehydes

(d) optical rotation only when substituted by deuterium

'x' gm of a compound A3B2C5 contains 'y' gm of A atoms

 

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how to represent the possible fischer projections for 2-bromohexane