52. Which of the following functional groups would NOT show an IR absorbance above 3000 cm^-1?
(A) An amine (NH₂)
(B) A carbonyl (C=O)
(C) An alcohol (OH)
(D) A vinylic carbon-hydrogen bond (=C-H)
(E) A methylene hydrogen (-CH₂-)

48. If a compound has the –OH, –OCH3, and –CHO groups all attached to a single benzene ring, the IUPAC name of the compound is based on which of the following? (A) Anisole (B) Benzaldehyde (C) Phenol (D) Methylether (E) Phenyl

49. Which one of the following would NOT be a suitable solvent for Grignard reagents? (A) Diethyl ether (B) Tetrahydrofuran (THF) (C) Ethanol (D) Hexane (E) They would all be suitable solvents

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

51. Consider the SN1 reaction of tert-butyl chloride with iodide ion: (CH3)3C-Cl + I - → (CH3)3C-I + Cl- If the concentration of iodide ion is doubled, the rate of forming tert-butyl iodide will: (A) Double (B) Increase 4 times (C) Remain the same (D) Decrease (E) Triple

53. Which part of the electromagnetic spectrum interacts with the nuclear spins of protons ? (A) Radio Waves (B) X-Ray radiation (C) Visible Light (D) Infrared radiation (E) Ultra violet light

54. The pinacol rearrangement proceeds via intermediate. (A) carbanion (B) carbocation (C) radical (D) carbene (E) neutral

55. Which carbon in the following sugar is the anomeric carbon atom? (A) a (B) b (C) c (D) d (E) e

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.

57. Which of the following combinations of reactants would produce a meso compound? (A) Cis-3-hexene and Br2 (B) Trans-3-hexene and Br2 (C) Cis-3-hexene and Br2 in H2O (D) Trans-3-hexene and Br2 in H2O (E) Trans-3-hexene and H2/Pd/C

58. What is the product of the following sequence of reactions? (A) 1,1-Diethylcyclopropane (B) Cis-1,2-diethylcyclopropane (C) Trans-1,2-diethylcyclopropane (D) Cis and trans-1,1-diiodo-2,3-diethylcyclopropane (E) Cis-1,2-diethyl-3,3-diiodocyclopropane