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If there is no rotation of plane polarised 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 achiral

Correct answer: the compound may be a racemic mixture

Solution

A racemic mixture contains equal amounts of enantiomers, which cancel out each other's optical activity, resulting in no rotation of plane-polarized light.

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