What is your reference point for a front limitation?

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.

The london company was an english joint stock company established in 1606 by royal charter by king james i with the purpose of establishing colonial settlements in north america.