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11 Nov 2019
Spring 2018 13. Which of the following compound s will produce a prominent (M-15) peak in the mass spectrum? A) 2-methylheptane B) 1-heptanol C) heptanamine D) 1-chloroheptane E) none of these 14. El ectrospray ionization is used to obtain mass spectra of proteins because A) it allows for faster fragmentation of molecular ion B) the molecular ion usually does not undergo fragmentation C) it allows for slow fragmentation of molecular ion D) none of these 15. Calculate the degree of unsaturation for CgHıN 11N. A) 4 B) 6 C) 2 D) 5 E) none of these 16. Which of the following can not be probed by an NMR spectrometer? A) nucleus with odd number of protons & odd number of neutrons B) nucleus with odd number of protons &even number of neutrons c) nucleus with even number of protons & odd number of neutrons D) nucleus with even number of protons & even number of neutrons E) none of these 17. How many nuclear spin states are possible for the H nucleus? A) 1 B) 2 c) 4 D) S E) none of these 18. protons experience a net magnetic field strength that is smaller than the applied magnetic field A) Deshielded 8) Shielded C) Paramagnetic D) Diamagnetic E) none of these 19. Which of the following is true about the relationship between the energy gap (AE) between the spin states for a H nucleus and the strength of the external magnetic field? A) they are inversely proportional B) they are directly proportional C) there is no relationship D) the magnetic field is slightly less E) none of these 3IPS 3
Spring 2018 13. Which of the following compound s will produce a prominent (M-15) peak in the mass spectrum? A) 2-methylheptane B) 1-heptanol C) heptanamine D) 1-chloroheptane E) none of these 14. El ectrospray ionization is used to obtain mass spectra of proteins because A) it allows for faster fragmentation of molecular ion B) the molecular ion usually does not undergo fragmentation C) it allows for slow fragmentation of molecular ion D) none of these 15. Calculate the degree of unsaturation for CgHıN 11N. A) 4 B) 6 C) 2 D) 5 E) none of these 16. Which of the following can not be probed by an NMR spectrometer? A) nucleus with odd number of protons & odd number of neutrons B) nucleus with odd number of protons &even number of neutrons c) nucleus with even number of protons & odd number of neutrons D) nucleus with even number of protons & even number of neutrons E) none of these 17. How many nuclear spin states are possible for the H nucleus? A) 1 B) 2 c) 4 D) S E) none of these 18. protons experience a net magnetic field strength that is smaller than the applied magnetic field A) Deshielded 8) Shielded C) Paramagnetic D) Diamagnetic E) none of these 19. Which of the following is true about the relationship between the energy gap (AE) between the spin states for a H nucleus and the strength of the external magnetic field? A) they are inversely proportional B) they are directly proportional C) there is no relationship D) the magnetic field is slightly less E) none of these 3IPS 3
Elin HesselLv2
4 Apr 2019