45. From the structures (I-IV) giving below which one belongs to nucleotide. (A) I (B) II (C) III (D) IV (E) None of the above

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