Place each description under the person whose theory it best describes. geocentric
Ptolemy
Copernicus
Kepler
stars orbit Earth
laws of planetary motion
elliptical orbits
Earth orbits sun
heliocentric

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.