b) Copy and complete the table below, identifying one analytical technique, different in each case, that can be used to obtain the following information indicated. Information required Analytical technique Relative atomic mass of an element (Ar) The functional groups and strength of bonds in an organic compound The detailed structure of an organic molecule (without degrading the sample) (c) Describe what happens on a molecular level when hydrogen sulfide molecules absorb infrared radiation. (d) Explain the following observations: i. The absorptions obtained from 1H NMR spectroscopy occur at much lower frequencies than those obtained from IR spectroscopy. ii. Hydrogen bromide is infrared active whereas bromine is infrared inactive.
b) Copy and complete the table below, identifying one analytical technique, different in each case, that can be used to obtain the following information indicated.
| Information required | Analytical technique |
|
Relative |
|
|
The functional groups and strength of bonds in an organic compound |
|
|
The detailed structure of an organic molecule (without degrading the sample) |
(c) Describe what happens on a molecular level when hydrogen sulfide molecules absorb infrared radiation.
(d) Explain the following observations:
i. The absorptions obtained from 1H NMR spectroscopy occur at much lower frequencies than those obtained from IR spectroscopy.
ii. Hydrogen bromide is infrared active whereas bromine is infrared inactive.
(e) Wavenumbers are the most common unit used to specify infrared absorptions. State the relationship between wavenumber and wavelength, and show how wavenumber is related to energy.
(f) Explain why stretching frequencies decrease from C−Cl to C−Br to C−I.
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