Question

What type of spectrum is shown here? What type of electromagnetic radiation is associated with the peaks in this spectrum? ultraviolet and visible light infrared radiation radio waves the frequency that causes a nucleus to flip its spin O the vibration frequency of a bond What is measured in this spectroscopic method? the absorption wavelength related to an excited electron state

Answer 1

Concepts and reason

A spectrum of compound is given which needs to be identified as IR, NMR or UV/Visible. Firstly, identify the parameters between which the spectrum is plotted then, relate the spectrum with the correct form. Once, the spectrum is identified then, its electromagnetic radiation range can be acknowledged and its application in the spectroscopy.

Fundamentals

Spectroscopy is based on the fact that the various molecules absorbs different amount of radiation at different frequencies when interacted with electromagnetic radiations. Thus, spectroscopy provides a technique to distinguish among the various compounds. The three basic spectroscopic techniques are as follows:

• NMR:

• IR

• UV/Visible

Consider the following electromagnetic spectra:

The given spectrum of compound is plotted as a plot of transmittance versus wavenumber $\left( {{\rm{c}}{{\rm{m}}^{ - 1}}} \right)$ hence, the spectrum shown is IR spectra.

As the spectrum of the given compound is identified as IR spectrum hence, the associated electromagnetic radiation is infrared radiation.

Molecule absorbs IR radiation when the vibration of the bond matches with the IR frequency. Hence, IR spectroscopy is used to identify the vibrational frequency of the bond.

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