An oligarchy is a form of government where one king rules.

Actually an oligarchy is a form of government where a certain group of people are in power.  It is usually controlled by rich and powerful families who establish political dynasties to ensure the continuation of power.  It can also be a military junta who came into power under certain circumstances. Usually they rely on oppression to rule over people.

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.