10 Questions
What is the difference between the number of absorption peaks in the N-H stretch region in a primary amine and a secondary amine?
Primary amine usually has two absorptions, while secondary amine has one absorption peak.
At what approximate wavenumber does the symmetric stretch absorption peak for a nitro group appear?
Approximately 1350 cm-1.
What kind of absorptions are fundamental absorptions?
They arise from excitation from the high ground state to lowest-energy excited state.
What are overtones in the context of vibrational frequencies?
Result from excitation to higher energy state corresponding to integral multiples of the fundamental frequency.
How are combination bands formed in a molecule?
When two vibrational frequencies couple to give rise to a vibration with a new frequency within the molecule.
What is the nature of non-fundamental absorptions?
They are weak and broad.
What are difference bands in the context of vibrational frequencies?
Similar to combination bands.
What does the presence of weak overtone, combination, and difference bands contribute to in an infrared spectrum?
The complexity of the spectrum.
What is the excitation process for fundamental absorptions?
Excitation from the high ground state to lowest-energy excited state.
What is the basis for the formation of overtones in vibrational frequencies?
Integral multiples of the frequency of the fundamental.
Learn about how NMR induces changes in the magnetic properties of certain atoms nuclei, ionization and fragmentation of molecules, identifying functional groups, determining the number of each type of protons, and calculating the molecular weight of a molecule. This quiz is based on a lecture by Dr. Nabaz Abdulmajeed on the application of Infrared Spectroscopy in organic synthesis.
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