76. A compound with the sum formula C₃H₆O has an IR peak at 1715 cm^-1 and only one singlet in 1H-NMR. The compound is ______.
(A) Propionaldehyde
(B) Acetone
(C) Allyl alcohol
(D) Propylene oxide
(E) Methyl vinyl ether

77. In mass spectrometry, a molecule with one bromine atom shows M and M+2 peaks in a ratio of approximately ______. (A) 1:1 (B) 3:1 (C) 1:3 (D) 9:6:1 (E) 1:2:1

78. Which of the following statements about the isoelectric point (pI) of amino acids is correct? (A) At pH ＜ pI, it is negatively charged. (B) Solubility is highest at pH = pI. (C) At pH = pI, the net charge is zero. (D) All amino acids have a pI of 7. (E) pI is independent of the side chain.

79. 19F-NMR spectroscopy is increasingly used in medicine for non-invasive imaging and monitoring of fluorinated pharmaceuticals (e.g., fluorinated anesthetics, anticancer drugs like 5-fluorouracil, or perfluorocarbons as artificial blood substitutes/oxygen carriers). Consider the compound PCl2F3 (a model phosphorus chlorofluoride with trigonal bipyramidal geometry, relevant to understanding dynamic processes in fluorinated compounds or analogs in bioinorganic/organofluorine chemistry). In a solution of PCl2F3 in isopentane at -22°C, how many peaks are observed in the 19F-NMR spectrum? (A) 0 (B) 1 (C) 2 (D) 3 (E) 4

80. Consider the reaction CO2(g) + 2H2O(g) → CH4(g) + 2O2(g) with ΔH° = 803 kJ. Which of the following options will increase K? (A) increasing the temperature of system (B) decreasing the number of moles of methane (C) increasing the volume of system (D) increasing the number of moles of CO2 (E) none of the above

81. Metal carbonyl complexes are studied in the context of potential therapeutic CO delivery in medicine as carbon monoxide-releasing molecules (CORMs). Predict which CO ligand in the following complexes has the highest CO stretching frequency (νCO in IR spectroscopy). (A) bridging CO of Fe2(CO)9 (B) [Mn(CO)6]+ (C) (CO)5Cr=C(OMe)Ph (a Fischer carbene complex) (D) [V(CO)6]- (E) fac-Cr(CO)3(NH3)3

82. Bio-organometallic carbonyl complexes can release CO in vivo for therapeutic effects, such as reducing inflammation, pain, and oxidative stress. Which property makes a metal carbonyl complex suitable as a therapeutic CORM? (A) Extreme kinetic inertness, preventing CO release (B) The ability to release CO under physiological conditions (triggered by light or ligand exchange) (C) High toxicity due to rapid metal dissociation (D) Strong irreversible metal-protein binding (E) The presence of only organic ligands and no metal ions

83. Which point group best describes the symmetry of the staggered conformation of ferrocene (an organometallic scaffold sometimes explored in drug design)? (A) D5d (B) D5h (C) S5 (D) C5v (E) D5

84. In medicinal chemistry, the stereochemistry of coordination complexes can strongly influence their biological activity. Consider the complex [Co(en)2Cl2]+, where en = ethylenediamine, a ligand often used in metal-based drug design. How many stereoisomers are possible for the complex [Co(en)2Cl2]+? For this question, treat the chelate ring formed by the en ligand as planar. (A) 1 (B) 2 (C) 3 (D) 4 (E) 5

85. A sample solution is analyzed using a UV-Vis spectrophotometer. Under specific experimental conditions, 80.0% of the incident light is either absorbed or scattered and fails to reach the detector. What is the absorbance ( A ) of this solution (given log2≈ 0.30; log4≈ 0.60; log6≈ 0.78; log8≈0.90)? (A) 0.100 (B) 0.200 (C) 0.700 (D) 0.800 (E) 0.400

86. Rhenium complexes, including those with metal-metal bonds, are widely studied in medicinal inorganic chemistry for applications in nuclear medicine (e.g., 186Re and 188Re radioisotopes for cancer radiotherapy) and as potential redox-active therapeutic agents. When [Re2Cl8]2- is reduced by one electron, what is the metal-metal (Re-Re) bond order of the new complex? (A) 3 (B) 3.5 (C) 4 (D) 4.5 (E) None of the above

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