The main cause of the Civil War was fighting over the issue of A) slavery B) immigration Eliminate C) income taxes D) natural resources

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.

S^2 = a4^2 = a4 * 4 = a16 centimeters = area of the square