Circle the best answer- In infrared spectroscopy, a) absorption of energy by the

Question

Circle the best answer- In infrared spectroscopy, a) absorption of energy by the sample results in stretching and bending vibrations of the bonds in the molecule. b) the sample is irradiated with radio waves in the presence of a magnetic field. c) the sample is irradiated with UV radiation causing HOMO to LUMO transitions. d) the sample is ionized with an electron beam, resulting in fragmentation of the molecule. How many different "environments" are the hydrogens in within the following molecules? (How many sets of signals would you expect to observe in their ^1 H-NMR spectra?)

Explanation / Answer

Ans 16. a . absorption of energy by the sample results in stretching and bending vibrations of the bonds in the molecule .

The photon energies associated with these infrared radiations when absorbed by the material sample , induce vibrational excitation of the covalently bonded atoms an groups of the molecule .

The frequency of the vibration is determined by the strength of bonds .

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