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

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

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統計： A(0), B(1), C(0), D(0), E(0) #3854099

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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

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

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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

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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