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exam1akey - Tuesday CHM 2210 Sec 4830 Exam#1 Form A Answer...

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Tuesday, September 23, 2008 CHM 2210 Sec. 4830 Exam #1 Form A Answer Page 1 of 2 Answer sheet pts. Last name: First name: UFID: /100 Put your answers in the spaces, or check your answer 1. ( 17 pts ) Formamide resonance. H C NH 2 O a b (a) (b) O C N O C N ( c ) ( d ) ( c ) ( d ) O C N O C N O C N (e) O–C–N (f) a a,b yes no (g) H C NH 2 O H C NH 2 O 3 0 1 3 0 0 –1 +1 0 –1 0 +1 sp 2 sp 2 sp 2 120° __ 17 _ 2. ( 13 pts ) Amines C 3 H 9 N (a) (b) (c) The four amines are [1 word] ............ constitutional .............................. isomers. (a) (b) (a) (b) (a) (b) NH 2 NH 2 N H N __ 13 _ 3. ( 4 pts ) Polarity [1 = lowest, 4 = highest polarity] H 3 C CH 3 H 3 C F H 3 C Br H 3 C Cl 2 1 3 4 ___ 4 _ 4. ( 12 pts ) (a) IUPAC Name. (b) Circle all 3° C. (c) Mark [*] chiral C. 3-ethyl-2,5-dimethylhexane (a) Name: * __ 12 _ __ 46 _ K E Y
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Tuesday, September 23, 2008 CHM 2210 Sec. 4830 Exam #1 Form A Answer Page 2 of 2 Answer sheet pts. 5. ( 14 pts ) cis -1,3-Dimethylcyclohexane __ 46 _ (b) Alternative chair conformations (c) Circle the more stable (e) Strain (1 word) yes no (f) chiral achiral (g) (d) CH 3 CH 3 (a) Flat ring structure
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