7.(S)(+)-Butanol shows a specific rotation at +13.52° . What is the ratio of (S)(+)-Butanol and (R)(-)-butanol when the measured rotation equals to +6.76° ? (A)(S):(R) = 4:1 (B)(S):(R) = 2:1 (C) (S):(R) = 1:2 (D)(S):(R) = 1:2.5 (E)(S):(R) = 3:1

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

7.(S)(+)-Butanol shows a specific rotation at +13.52° . What is the ratio of (S)(+)-Butanol and (R)(-)-butanol when the measured rotation equals to +6.76° ? (A)(S):(R) = 4:1 (B)(S):(R) = 2:1 (C) (S):(R) = 1:2 (D)(S):(R) = 1:2.5 (E)(S):(R) = 3:1

其他試題

7.(S)(+)-Butanol shows a specific rotation at +13.52° . What is the ratio of (S)(+)-Butanol and (R)(-)-butanol when the measured rotation equals to +6.76° ?
(A)(S):(R) = 4:1
(B)(S):(R) = 2:1
(C) (S):(R) = 1:2
(D)(S):(R) = 1:2.5
(E)(S):(R) = 3:1