13. If the IR spectrum of ChemicalX shows NO absorption above 3000 cm1, which of

Question

13. If the IR spectrum of ChemicalX shows NO absorption above 3000 cm1, which of the following could Chemical X possibly be? Hint: draw an example of each structure with all hydrogens shown and think about what stretching vibrations would be present. A. An alcohol B. A terminal alkyne C. An internal alkyne D. A cis-alkene 14. Which of these compounds will have the highest frequency CO stretching vibration? 15. Which of the above will have a singlet in its 'H NMR spectrum? 16. Which of the above will have a doublet of quartets in its 'NMR spectrum? 17. Which of the above does NOT contain a pair of enantiotopic hydrogens?

Explanation / Answer

Cis alkene ir peak range= 3100-3000 cm-1

15) B molecule contain singlet in its proton nmr

CH3OCOCH2CH3

The CH3 group in its left hand side has singlet peak in proton nmr because their is no Hydrogen attached to its adjacent position

17) B, C, D contain unsymmetrical molecule therefore doesnot contain enantiotopic hydrogens

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