Chem14C_SU07_Exam1_Key

Chem14C_SU07_Exam1_Key - ANSWER KEY Chem 14C Summer 2007...

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ANSWER KEY Chem 14C Last Name: First Name: Summer 2007 Section: Answer all Questions. A copy of the periodic table is attached Question 1 ( 20 points) Aspartame (ASP) is a sweetener is marketed under number of trade names is an ingredient of many consumer foods and beverages sold worldwide. It is commonly used in diet soft drinks, and is often breaks down when when heated and loses much of its sweetness. Aspartame is also one of the sugar used by diabetics. Answer the following questions ASP a. Write a molecular formula for aspartame (ASP). ______ Ans: C14 H18 N2 O5 b. How many lone pairs in this molecule. ____Ans: 12 c. How many sp 3 hybridized carbons in ASP molecule? Give a number __Ans: 5 d. How many sp 2 hybridized carbons in ASP molecule? ____Ans: 9 e. What is the degree of unsaturation in ASP? Give a number __Ans: 7 f. Place an asterisk on the chiral carbon(s). g. Write numbers in the blank. ASP has _2__ stereocenter(s) and therefore __4_ possible stereoisomers. h. What is the most electronegative element in ASP? C H O N F Ans: Oxygen (O) i. Circle at least one conjugate pi system in ASP. Be careful to include the four atoms in the circle. ( Ans: Circle four consecutive sp2 carbons on the benzene ring) j. The enantiomer of ASP rotates the plane of plane-polarized light in the opposite direction as ASP. True or false ___ Ans: True
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2. [ 20 points] Explain the following; a. Which structure is more stable? Circle one CH 3 CH=CH-CH=CH-CH 3 or CH 3 CH=CH-CH 2 -CH=CH 2 b. Which cation is more stable. Circle one. CH
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Chem14C_SU07_Exam1_Key - ANSWER KEY Chem 14C Summer 2007...

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