Question

Which of the following would you expect to have the longer Ama? Explain. 18. How can UV-visible spectroscopy be used to monitor a chemical reaction? 19. Which of the following would show a C-O stretch at the lowest frequency in its IR spectrum? 20. O NH2 ОН OCH3 I1 II IV V Which of the following would be likely to exhibit an absorption band of moderate to strong 21. intensity at 2240 cm? d. H,C-c N а. сн,— сна сH-сH b. HC-CCH е. Cн,—сн-сн —он c. HyC-CH-NH If one wished to monitor a frequency to determine whether the following reaction had taken 22. place, which frequency would be the best choice? CH, d. -1 a. 2200 cm 1050 cm -1 e. 2950 cm -1 b. 1600 cm -1 3300 cm C.
which of the following would you expect to have a longer lambda max? explain?

pls answer all the questions

Answer 1

18. Compound B, since it has homoannular diene (conjugate diene). It absorbs maximum wavelength.

19. By observing the colour of the Compounds

20. Amide ,Iii at 1630-1645 cm-1

Order: ester>aldehyde> ketone> Carboxylic acid>amide

21. Option D, nitrile, show a peak at 2250 for CN group.

22. Option C, 3300 since NH stretch appears at 3300 cm-1 which disappears in the product.