What happened during the 2014 syrian refugee crisis

According to the Office of the United Nations High Commissioner for Refugees (UNHCR), by late August 2014 the number of refugees who had fled the Syrian Civil War, in the aftermath of the Syrian uprising of 2011, had surpassed three million.

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.