Practice Examination.. Organic Chemistry... organicFinal OrganicFinal Orga 12. Is the following vector field conservative. If yes, find a potential function for it: F - (2r sin(2y) - 3y.2 - 6ry + 212 cos(2y))- 13. Given the F in the previous problem, evaluate / F - ds where C is the eastern semicircle of radius 2 centered at the origin oriented clockwise. 14. Evaluate yds where S is given by the region I- + 1 12+ 2" - 4.0