4. What occurs to covalent bonds when a specific amount (quantized) of infrared

Question

4. What occurs to covalent bonds when a specific amount (quantized) of infrared radiation is absorbed? a. It warms up . It flies around c. It spins faster d.It vibeates faster e. It emits light 5. In the infrared spectra of symmetric anhydrides, two peaks are observed even though the 2 carbonyl groups are chemically equivalent. Explain why this takes place. Hint: Think about 1 amines 6. An unknown compound has a molecular formula of CsHeO and contains a functional group attached to a 3° carbon. It has broad absorption band in the 3200-3550 em region and no absorption in the 1620- 1690 cm region. What is the structure for this compound? 7. Provide an explanation for the following trend with the carbonyl group of acid halides F R Br R v=1869 crn-1 v-1812 cm-1 v-1817 end 8. Which of the following bonds would show the strongest absorption in the IR? A. carbon-hydrogen B. oxygen-hydrogenC. nitrogen-hydrogen D. sulfur-hydrogen 9. Explain which of the following will have a higher earbonyl stretching frequency. 0 C-H C-H cl

Explanation / Answer

Ans 4 :d) It vibrates faster

The covalent bonds are formed by the sharing of electron pairs between the constituent atoms.

So when it absorbs the right amount of quantised infrared radiation , it kicks into higher state of vibration.

This amount of energy required will vary from bond to bond and is not same for all the bonds.

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