If there is no rotation of plane light by a compound in a specific solvent, though to be chiral, it may mean…

If there is no rotation of plane light by a compound in a specific solvent, though to be chiral, it may mean that:
  1. the compound is certainly meso
  2. there is no compound in the solvent
  3. the compound may be a racemic mixture
  4. the compound is certainly a chiral

Solution

Meso compound like meso tartaric acid is optically inactive due to the presence of planar molecular symmetry. Related Theory Meso compounds are molecules having multiple stereocenters, but their mirror images are superimposable. Meso compounds have an identical mirror image whereas enantiomers have a non-superimposable mirror image.

Asked in: NEET 2007

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