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Department of Chemistry University of Missouri-St. Louis Chemistry 261 The following questions are practice questions for the comprehensive portion of the final exam. Which bond in the following molecule is the shortest? CH3— CH.- CH = CH —C = 1 2 3 4 5 a. bond 1 b. bond 2 c. bond 3 d. bond 4 e. bond 5 eet of the following is the most likely electronic structure for ? 2H? a, H—C=C; Hq b. H-E€—E | H c. H—-~€—C—H d. H—C=c—H ® a e. H—C=C—H Write Lewis structures for the molecule given and show all formal charges. CH, CO Draw the Newman structure for the most stable conformation of 1-bromopropane considering rotation about the C,-C2 bond. Explain why trimethylamine, (CH3)3N:, has a considerably lower boiling point than propylamine CH3CH2CH2NH2, even though both compounds have the same molecular formula. If an acyclic alkane hydrocarbon contains n carbon atoms, how many hydrogen atoms must it also contain? a n+2 n-2 . 2n » n+ 2 .2n-2 Moadace 
