Refer to people who share a common characteristic without necessarily interacting or identifying with one another.

Social categories refer to people who share a common characteristic without necessarily interacting or identifying with one another. These categories are used by society to help label people and to see what type of group they belong to. People who share a common age, gender, education, income or any other identifier are put into social categories, even though they do not necessarily communicate with each other. These categories an be beneficial for organization, but they can also come with a lot of stigmas or prejudices.

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.