Exam1B - Tuesday February 3 2009 CHM 2210 Sec 4140 Exam#1...

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Tuesday, February 3, 2009 CHM 2210 Sec. 4140 Exam #1 Form B Question Page 1 of 2 For your answers use the answer sheet Place your answers on answer sheet, page 1 : Graded by 1. ( 10 pts ) Dempsey (a) State the orbital hybridization of each highlighted (circled) atom. (b) Predict the bond angles about each highlighted (circled) atom according to its hybridization. (Note: There is no 90° bond angle as shown in the structures). 2. ( 2 pts ) Dempsey Indicate the direction of polarity in each covalent bond by assigning symbols δ – and δ + to the atoms. 3. ( 9 pts ) Dempsey Consider cis - and trans -1,3-dimethylcyclopentane . (a) For both isomers draw pentagon ring structures with wedged and dashed bonds extending to the substituents. (b) Which isomer is optically active , cis or trans ? (c) Which isomer is a meso compound , cis or trans ? (d) Which isomer is achiral , cis or trans ? 4. ( 8 pts ) Dempsey (a) Complete the structure with all unshared electron pairs and charges . (b)
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Exam1B - Tuesday February 3 2009 CHM 2210 Sec 4140 Exam#1...

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