Two brothers inherit their parents' property. the brothers are 16 years old and 19 years old. the 19 year old does not want the property. he deeds his share to his younger brother. the 16 year old sells the property. in order for the sales contract to be valid and enforceable when the 16 year old sells, who must sign the agreement?

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.