La descripción de las transformaciones
geométricas que ayudará a autorregular algunas emociones​

I'm going to go with 1,982 feet because of all of the ice.                                               ps its this is not the answer go with d 6,500.

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.