17.The relationship between magnetic field strength and the energy difference between nuclear spin states is: (A)The are independent of each other. (B)They are directly proportional. (C)They are inversely proportional. (D)They relationship varies from molecule to molecule. (E)None of these.

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

17.The relationship between magnetic field strength and the energy difference between nuclear spin states is: (A)The are independent of each other. (B)They are directly proportional. (C)They are inversely proportional. (D)They relationship varies from molecule to molecule. (E)None of these.

其他試題

17.The relationship between magnetic field strength and the energy difference between nuclear spin states is:
(A)The are independent of each other.
(B)They are directly proportional.
(C)They are inversely proportional.
(D)They relationship varies from molecule to molecule.
(E)None of these.