50. (S) (+)-Butanol shows a specific rotation at +13.52o . What is the ratio of (S) (+)-butanol and (R) (-)-butanol when the measured rotation equals to +6.76o ? (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

50. (S) (+)-Butanol shows a specific rotation at +13.52^o . What is the ratio of (S) (+)-butanol and (R) (-)-butanol when the measured rotation equals to +6.76^o ?
(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

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統計： A(0), B(4), C(0), D(1), E(11) #1074596

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2024/02/16

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32. 已知(R)-2-丁醇...

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56. A tree diagram for the splitting of a proton Ha is reproduced below. What is the origin of this splitting pattern? (A) Ha is coupled to two nonequivalent hydrogens with identical coupling constants. (B) Ha is coupled to two nonequivalent hydrogens with different coupling constants. (C) Ha is coupled to three nonequivalent hydrogens with identical coupling constants. (D) Ha is coupled to three nonequivalent hydrogens with different coupling constants. (E) Ha is coupled to three equivalent hydrogens with identical coupling constants.

50. (S) (+)-Butanol shows a specific rotation at +13.52o . What is the ratio of (S) (+)-butanol and (R) (-)-butanol when the measured rotation equals to +6.76o ? (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

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50. (S) (+)-Butanol shows a specific rotation at +13.52^o . What is the ratio of (S) (+)-butanol and (R) (-)-butanol when the measured rotation equals to +6.76^o ?
(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