CEM143_2006_Exam_1 - CEM 143 Fall 2006 Exam 1 6 October...

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CEM 143 Fall 2006 Exam 1 6 October 2006 Name_____________________ Section_____ PID___________ 1 (21 pts.) 2 (24 pts.) 3 (12 pts.) 4 (11 pts.) 5 (24 pts.) 6. (8 pts.) Total 100 pts
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1.a (9 pts.) Provide the chemical formulas (i.e. C x H y ) for the following 1.b (3 pts) Rank the following 4 elements in order of INCREASING electronegativity. F, O, Li, N Lowest electronegativity highest 1.c (3 pts) Draw the electron dot structure forAlCl 3 . (Consider only the valence electrons of Al). 1.d (3 pts) What is the formal charge on boron in: 1.e (3 pts) Arrange the following in terms of INCREASING melting point. H 3 CO B OCH 3 OCH 3 H 3 CO C AB C
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2.d (12 pts) Draw the structures of: m -dibromobenzene S -1-bromo-1-chloropropane tert -butyl bromide allyl chloride 2.d (12 pts) Name the following: Br Cl Cl CC CH 3 CH 3
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3.a (3 pts.) You can draw 3 resonance structures that describe the intermediate formed in the attempted bromination of nitrobenzene at the para position . I have drawn one of the structures. One resonance structure is particularly unfavorable. You provide the other two resonance structures, and indicate which structure is particularly unfavorable.
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CEM143_2006_Exam_1 - CEM 143 Fall 2006 Exam 1 6 October...

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