80. Which reagent would convert 1,3-octadiene into 3-octen-2-ol?
(A) KMnO₄/^-OH
(B)OsO₄
(C)mCPBA, then H₃O⁺
(D) Cl₂/H₂O
(E) H₃O⁺

81. At some temperatures, the relative reactivities of 3°, 2°, and 1° alkane hydrogens in free radical chlorination are in the ratio of 5:3:1. Thus, monochlorination of isopentane should produce these percentages of 2-chloro-2-methylbutane (a), combined 1-chloro-2-methybutane and 1-chloro-3- methylbutane (b), and 2-chloro-3-methylbutane (c): (A) 8% a, 75% b,17%c (B) 25% a, 45% b, 30% (C) 29% a, 44% b,18%c (D) 30% a, 35% b, 35% c (E) 36% a, 43% b, 21%c

82.Starting with benzene, the best method for preparing p-nitrobenzoic acid is: (A) HNO3/H2SO4, then CH3CI/AICl3, then separation of isomers, then KMnO4/- OH/heat, followed by H3O+ (B) CH3CI/AICl3, then HNO3/H2SO4, then separation of isomers, then KMnO4/-OH/heat, followed by H3O+  (C) CH3CV/AICl3, then KMnO4/-OH/heat, followed by H3O+, then HNO3/H2SO4 (D) HNO3/H2SO4, then KMnO4/-OH/heat, followed by H3O+, then CH3CI/AICl3 (E) HNO3H2SO4； then CO2, followed by H3O+

83. Arrange the following isoelectronic species in order of increasing ionic radius. (A)O2-＞F-＞Na+＞ Mg2+ (B) F-＞O2-＞ Mg2+＞ Na+(C) Mg2+ ＞ O2-＞ Na+＞ F- (D) Na+＞F-＞Mg2+＞ O2- (E) Mg2+＞ Na+＞F-＞O2-

84 What is the formal charge of oxygen in carbon monoxide? (A)+2 (B)+1 (C)0 (D)-1 (E)-2

85. Nylon is synthesized via the polycondensation reaction. For example, the Nylon 6,6 is from the condensation reaction of hexamethylenediamine and adipic acid. To obtain the polymeric product with good physical properties, the conversion of the condensation needs to be above 99% to achieve the high molecular weight. Accordingly, when we select the monomer for the production of Nylon, what is the lower limit of the equilibrium constant? (A)10(B)100(C)1000(D) 10000(E) 100000

86. How many signals does the unsaturated ketone (CH3)CHCH2C(O)CH=CH2 have in 1H NMR and13C NMR spectra? (A) 51H signals, 6 13C signals (B) 6 1H signals, 6 13C signals (C)  6 1 signals, 7 13C signals (D)51H signals, 7 13C signals (E) 51H signals,5 13C signals

87. X in limited amount is present in soil and is essential for plants nutrients but if present in high concentration can be harmful both for plants, animals and aquatic organisms. What is X? (A) Hydrogen sulphide (B) Carbon dioxide (C) Ammonia (D) Water (E) All of above

88.Which of the following electrodes are commonly used as a reference electrode in voltammetry? (A) Platinum wire (B) Carbon paste (C) Mercury thin film (D) Gold disk (E) Silver chloride-coated silver wire

89.In fall 2017, clouds of ruthenium-106 (106Ru) radioactive contamination appeared over Eastern Europe. Scientists measured the airborne radio-ruthenium isotope ratio (103Ru/106Ru) and confirmed its concentration. Which of the following techniques is the most suitable for the detection of the103Ru/106Ru ratio? (A) Inductively coupled plasma mass spectrometry (ICP-MS) (B) Matrix-assisted laser desorption/ionization-time of flight mass spectrometry (C) Electrospray ionization mass spectrometry (D) Fourier-transform ion cyclotron resonance mass spectrometry (E) Elemental analyzers

90, Capillary electrophoresis is powerful in detecting various genetic diseases, such as Thalassemia and Spinal Muscular Atrophy. Which of the following modes in capillary electrophoresis is the most suitable for diagnosing genetic disease (i.e., separation of DNA molecules)? (A) Capillary zone electrophoresis (B) Capillary isoelectric focusing (C) Micellar electrokinetic chromatography (D) Capillary electrochromatography (E) Capillary gel electrophoresis

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