1. What do we look for in an IR spectrum? 2. As wavenumber increases, wavelength

Question

1. What do we look for in an IR spectrum? 2. As wavenumber increases, wavelength ____________________, frequency _____________________ and energy _______________________. 3. What happens to a covalent bond when it absorbs IR? 4. Which bond is longer, the C=C bond in benzene or the C=C bond in an alkene? Why? 5. Most C-H bonds are found in zone 2. Why, then, is the sp C-H found in zone 1? 6. Organic compounds have a lot of carbon-carbon single bonds. Why don’t we identify them in IR spectra? 7. Which bond is longer, C-Br or C-O? Why? 8. Why are the peaks for CC less intense than CN? 9. On an IR spectrum, how are the O-H of an alcohol and the O-H of a carboxylic acid different? 10. Which peak would be more intense, a peak for a terminal (at the end of the molecule) C=C or a peak for a C=C that appears in the middle of the molecule? Why?

Explanation / Answer

1) IR spectrum gives s sufficient information about structure of a compounds.

2) As wavwnumber increases wavelength decreases , frequency increases and energy increases.

3) When IR radiations are absorbed molecular rotations take place.

4) The double bond length in benzene is longer because of electron delocalisation observed in benzene.

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