every time a boy visited his grandfather, he would pass a house with a large dog in the yard that would bark and scare the boy. years later, the boy becomes anxious whenever he visits his grandfather, even though the dog is no longer there. the boy learned to become anxious in this situation through which process?

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.