Exam-1-Fall07-key - 1 True or False(max 30 pts a Organic...

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Exam-1-Fall07-key.doc page 2 1. True or False. (max 30 pts) a) Organic chemistry originated from the study of biological materials. True b) The more electronegative an atom is, the weaker its ability to attract electrons. False c) Non-polar bonds are formed between atoms of the same electronegativities. False d) A molecule containing nonpolar bonds cannot be polar. True e) CH 2 =CF 2 can exist as cis and trans isomers False f) Weaker acids have lower pK a values than stronger ones. False g) The conformation of cyclopropane must always be planar. True h) The number of hybrid orbitals an atom has equals its number of σ bonds and lone pairs. True i) Cis and trans isomers can exist with molecules containing double bonds. True j) A σ molecular orbital must be cylindrically symmetrical. True
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Exam-1-Fall07-key.doc page 3 2. Draw Lewis structures (lines for bonds and dots for all lone pairs) for the following molecules: (20 pts) ( For each problem : Correct bonds: 3 pts ; correct lone pairs: 2 pts ) NO 2 - (a) CH 3 CHO (b) (c) (d) CH 3 COOH CH 2 CF 2 O N O C C H O H H H C C O O H H H H C C H H F F
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