試題詳解

13.Consider the following statements concerning the effect of a trifluromethyl group-CF₃, on an electrophilic aromatic substitution. Which of these statements is (or are) correct? 1.The CF₃ group will activate the ring.  2.The CF₃ group will deactivate the ring.  3.The CF₃ group will be a meta director.  4.The CF₃ group will be an ortho, para director. 
(A)1,3
(B)1,4
(C)2,3
(D)2,4
(E)3,4