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Questions and Answers
Which functional group is known to have a signal slightly below 3000 cm-1 in an IR spectrum?
Which functional group is known to have a signal slightly below 3000 cm-1 in an IR spectrum?
- C=C stretch
- C-H stretch (correct)
- O-H stretch
- N-H stretch
What is the characteristic vibration mode of an alkene?
What is the characteristic vibration mode of an alkene?
- -C-H stretch
- C=C stretch (correct)
- C-O stretch
- =C-H stretch
Which type of compound typically shows an Ar-H stretch vibration mode?
Which type of compound typically shows an Ar-H stretch vibration mode?
- Aromatic compound (correct)
- Alkene
- Alkyne
- Alkane
What is the characteristic vibration mode of an alcohol?
What is the characteristic vibration mode of an alcohol?
Which of the following compounds is NOT expected to show an N-H stretch vibration?
Which of the following compounds is NOT expected to show an N-H stretch vibration?
What type of compounds will show a signal near 1600 cm-1, in addition to alkynes?
What type of compounds will show a signal near 1600 cm-1, in addition to alkynes?
What is the characteristic IR signal of alkanes?
What is the characteristic IR signal of alkanes?
What type of compounds will show a signal near 3400 cm-1?
What type of compounds will show a signal near 3400 cm-1?
What type of compounds will show a signal near 3000 cm-1, in addition to alkynes?
What type of compounds will show a signal near 3000 cm-1, in addition to alkynes?
What determines the number of peaks in the IR spectrum of amines?
What determines the number of peaks in the IR spectrum of amines?
What is the purpose of using a double-focusing mass spectrometer?
What is the purpose of using a double-focusing mass spectrometer?
What is the abundance of the 13C isotope?
What is the abundance of the 13C isotope?
What is the significance of the M-18 peak in a mass spectrum?
What is the significance of the M-18 peak in a mass spectrum?
What is the primary piece of information provided by the molecular-ion peak?
What is the primary piece of information provided by the molecular-ion peak?
What is the purpose of computer-based matching on the Registry of Mass Spectral Data?
What is the purpose of computer-based matching on the Registry of Mass Spectral Data?
What is the significance of the M+1 peak in a mass spectrum?
What is the significance of the M+1 peak in a mass spectrum?
What happens to alcohols when they are analyzed in a mass spectrometer?
What happens to alcohols when they are analyzed in a mass spectrometer?
What is the significance of the base peak in a mass spectrum?
What is the significance of the base peak in a mass spectrum?
What is the result of the presence of chlorine atoms in a molecule in a mass spectrum?
What is the result of the presence of chlorine atoms in a molecule in a mass spectrum?
What is the highest m/z signal in a mass spectrum?
What is the highest m/z signal in a mass spectrum?
What is the primary reason why carbon-12 nuclei are not suitable for NMR spectroscopy?
What is the primary reason why carbon-12 nuclei are not suitable for NMR spectroscopy?
What happens to the energy separation between the parallel and anti-parallel states when the strength of the external magnetic field increases?
What happens to the energy separation between the parallel and anti-parallel states when the strength of the external magnetic field increases?
Why is it possible to observe multiple signals in a proton NMR spectrum of a molecule?
Why is it possible to observe multiple signals in a proton NMR spectrum of a molecule?
What is the effect of increasing the radio frequency in an NMR spectrometer?
What is the effect of increasing the radio frequency in an NMR spectrometer?
What is the reason why hydrogen-1 nuclei are suitable for NMR spectroscopy?
What is the reason why hydrogen-1 nuclei are suitable for NMR spectroscopy?
What is the reason for atoms with thicker electron clouds requiring stronger magnetic fields in NMR spectroscopy?
What is the reason for atoms with thicker electron clouds requiring stronger magnetic fields in NMR spectroscopy?
Why do deshielded nuclei appear on the left side of the NMR spectrum?
Why do deshielded nuclei appear on the left side of the NMR spectrum?
What is the purpose of using the silicon compound TMS in NMR spectroscopy?
What is the purpose of using the silicon compound TMS in NMR spectroscopy?
What is the significance of proton equivalence in NMR spectroscopy?
What is the significance of proton equivalence in NMR spectroscopy?
What is the significance of the area under individual peaks in the NMR spectrum?
What is the significance of the area under individual peaks in the NMR spectrum?
What is the primary reason for the variation in the strength of the external magnetic field required to induce an NMR transition in different nuclei?
What is the primary reason for the variation in the strength of the external magnetic field required to induce an NMR transition in different nuclei?
As the electron cloud density around a nucleus increases, what is the effect on the strength of the external magnetic field required to induce an NMR transition?
As the electron cloud density around a nucleus increases, what is the effect on the strength of the external magnetic field required to induce an NMR transition?
In an NMR spectrum, which of the following is a direct result of the shielding effect?
In an NMR spectrum, which of the following is a direct result of the shielding effect?
What is the primary reason for the difference in the chemical shift of the blue and red H atoms in the NMR spectrum of methyl acetate?
What is the primary reason for the difference in the chemical shift of the blue and red H atoms in the NMR spectrum of methyl acetate?
What is the significance of the TMS signal in an NMR spectrum?
What is the significance of the TMS signal in an NMR spectrum?
What is the unit of the chemical shift in NMR spectroscopy?
What is the unit of the chemical shift in NMR spectroscopy?
What is the purpose of using tetramethylsilane (TMS) in NMR spectroscopy?
What is the purpose of using tetramethylsilane (TMS) in NMR spectroscopy?
Why do the methyl group hydrogens in propane appear as a single NMR signal?
Why do the methyl group hydrogens in propane appear as a single NMR signal?
What is the effect of increasing the external magnetic field strength on the chemical shift?
What is the effect of increasing the external magnetic field strength on the chemical shift?
Which of the following is a consequence of proton equivalence in NMR spectroscopy?
Which of the following is a consequence of proton equivalence in NMR spectroscopy?
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