2425Chapt12

2425Chapt12 - CHAPTER 12&13- (MS, IR, NMR -Practice...

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CHAPTER 12&13- (MS, IR, NMR -Practice Exercises) CHEM 2425 Dr. Pahlavan / Dr. Cherif / Dr. Dessens 1. The mass spectrum an benzylhalide (haloalkyl bezene) is given:             a) Identify the parent peak                                                   b) Identify the base peak c)   Determine the possible structure for the compound      d)   What is the molecular structure for the most stable cation fragment (most intense peak) 2. Give several types of spectroscopic data  IR,  1 H NMR , and  MS  of particular compounds. What are they?             a)    C 5 H 10 O                 b) C 8 H 7 N     1
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c) C 7 H 14 O          3 . Each of the following compounds is characterized by a single 1H NMR spectrum that consists of only  a single  2
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             peak having the chemical shift. Identify each compound.  a)   C 8 H 18  ;       0.9 ppm                                    b)   δ C 4 H 9 Br  ;         1.8 ppm δ   4. Each of the following compounds is characterized by a single  1 H NMR spectrum that  consists of two  peaks, both         singlets, having the chemical shifts indicated. Identify each compound.             a)   C 6 H 8   ;   2.7 ppm (4H) and 5.6 ppm (4H)  δ             b)    C 6 H 10 O 2 ;   2.2 ppm (6H) and 2.7 ppm (4H) δ        5. Deduce the structure of each of the following compounds in the basis of their   1 H NMR spectral and            molecular formula.            a)    C 8 H 10 δ 1.2 ppm (triplet, 3H)                  δ 2.6 ppm (quarter, 2 H)                                              δ 7.1 ppm (broad singlet, 5H)            b)   C 4 H 6
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2425Chapt12 - CHAPTER 12&13- (MS, IR, NMR -Practice...

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