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Problem Set I Key - Chem 343 Spring 2009 Name K e\1 Problem...

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Unformatted text preview: Chem 343 Spring 2009 Name: K e \1 Problem SetI I. There are three isomers for the formula C2H40. Draw the best possible Lewis structure for each isomer including all valence electrons. H "o: 'b—H l // H\ /" H ac— c C: C\ l \H H/ H H .‘CD'. l—l / (4 \C \d/ H/ \H II. Add pi and non—bonding electron pairs to each of the following structures to make the best possible Lewis structure. A.) . .. H ' O H H H H l H "Q. B.) H H H | 5‘.\ III. Each of the following examples shows the condensed structural formula for a neutral molecule or an ion along with a Lewis structure. Circle the structures that are completely correct as written and represent the best possible Lewis structure for/the formula. For the structures that are not completely correct or not the best possible structure draw the best structure. [ CH3002]e [CH30(O)CHzle (+9 [ CH3OHZI T H [leer/Zap ®{/ flu) 2' H—C—O\ a}, lil H 61/0/(0/ [06H50]e page] “K 2.“: H O.'/ | //O' H—C—N\ e I so need}: one Ees‘i sir-aciqu jar [he '27-an has MU, Pair; Maved L‘ an {-0 0 C 0V]? on O H .. Q l /0.‘ ‘ l—l——C 619/ v I “AK .42; /\ 05 u .59:- IV. For the following “good” Lewis structure, draw all of the additional “good” resonance forms that can be drawn. V. Circle the correct letter below each pair of bond—line structures to label the pair as one of the following: R = resonance forms (same compound) C = constitutional isomers D = different compounds (not isomers) 36H ‘ (9 H NHZ NH2 / G R @ n VI. Theobromine, closely related to caffeine, is the principal stimulant found in chocolate. In the bond-line structure of theobromine, shown below, give the hybridization at each of the indicated atoms. Note: formal charges are always shown in bond-line structures but nonbonding pairs of electrons (“ lone pairs”) are not normally shown and are not shown here. C D L o A/Sfj éP \ N/ HN I /> OAT “\SF Theobromine SPL ...
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