Ascientific theory a scientific theory is a strict set of rules and procedures that lead to inarguable fact. is just a theory. is based on continued observation and experiment. is a framework for proving an argument you know to be true. isn't used much in modern chemistry.

Ifound the exercise on the internet. attached is the list mentioned above.in order for a compound to be considered optically active it can't have any axis or plan of symmetry. the molecule  shouldn't also  be superimposable on its mirror image.with such considerations, the compounds that are optically active are: -third compound on the first image is optically active; -second and third compound from the second image are optically actives.