Rank each group of protons in order of increasing chemical shift. Hc а. b. CH3 На OCH,CH3 H, Hc

Counterfeit drugs are a common problem in developing regions of the world. Oftentimes, counterfeit pills are made with compounds such as lactose. A lab technician has obtained the IR spectrum shown above for a sample reported to be citalopram, an antidepressant drug. Does the IR spectrum belong to citalopram or lactose? Explain your answer by describing what feature of the IR spectrum confirms your choice and describe what feature is missing from the IR spectrum for the other compound. A. citalopram B. lactose

5. L-dopa is used in the treatment of Parkinson's disease. Identify the four most acidic protons and arrange them in order of increasing acidity. :O: g HO: :OH 6. Coumarins are a class of natural products produced by plants and animals. It has a wide variety of applications in cosmetics, food industry and fluorescent laser dyes. In the ¹HNMR spectrum of coumarin derivate shown below, the two signals farthest downfield are at 7.38 and 8.42 pm. Identify the two protons that most likely give rise to these signals and justify your answer using resonance structures. :O:

3. Protons A-E are identified on the spectrum below and correspond to the five unique protons in the molecule shown. (a) Place all the protons on the molecule and categorize them into Ha, Hb, etc. (b) Fill in the table for this molecule (see answer sheet). E الاس D N PPM B 72 A

A total of how many signals are expected in the ¹H spectrum of the given compound? CI о

In which of the following transition would be spin allowed? a) n to s* b) p to p* c) n to p* d) n to s*

Which one of the labeled hydrogen atoms in the given molecule will have the greatest chemical shift (furthest downfield)? م شد Ha Ho He Hd

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