The history of science is full of great works that have marked a turning point in the development of a branch of knowledge, and in which the proposals for a new theoretical frame of reference or a new systematization of the known facts. Explain this argument thoroughly with example​

What was the length to begin with?

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.