Question

What type of spectrum is this? UV/Vis IR NMR What type of electromagnetic radiation is associated with the peaks in this spectrum? ultraviolet and visiblelight radiowaves infrared radiation What is measured in this spectroscopic method? the vibrational frequency of a bond the frequency that causes a nucleus to flip its spin the absorption wavelength to an excited electron state

Answer 1

Concepts and reason

The problem is based on the concept of NMR.

NMR is an analytical technique which is used for the structural analysis of the compounds.

Fundamentals

Nuclei has spin and when magnetic field is applied, it aligns itself either in the direction or against the direction of magnetic field and shows signals in the NMR spectra. The NMR spectra is the plot of intensity and frequency with reference to TMS. This spectra is measured in the radiofrequency region.

Part A

UV/Visible spectrum is plotted between absorbance and wavelength. IR spectrum is plotted between %transmittance and wavenumber. Therefore, the spectrum do not represent UV/Visible or IR spectroscopy.

The graph belongs to the NMR spectroscopy because it shows chemical shift and signal intensity.

Part B

Ultraviolet and visible light is associated with the UV/Vis spectrum. Infrared radiation is used in the IR spectrum.

NMR spectroscopy is associated with the absorption of electromagnetic radiation in the radio frequency region. Therefore, radio waves are associated with the peaks in the spectrum.

Part C

In the IR spectroscopy, the vibrational frequency of bond is measured. The absorption wavelength related to an excited electron state is measured in the UV/Visible spectroscopy.

Nucleus are the charged particle and can flip in the magnetic field. In the NMR spectroscopy method, the frequency that causes a nucleus to flip its spin is measured.

Ans: Part A

The spectrum is NMR.

Part B

The spectrum is associated with the radio waves electromagnetic radiation.

Part C

The frequency that causes a nucleus to flip its spin is measured in the NMR spectroscopic method.