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Unformatted text preview: Sheet1 Page 1 In the molecular structure of caffeine, C8H10N4O2, which was given on the exam, all bonds were shown as single bonds. Some of the bonds may be double or triple bonds. Correct the structure by drawing in the missing bonds. Answer. Also draw in all lone pairs. Answer. The structure given in the answer is only one of many resonance structures but it is the one which places zero formal charg Estimate the bond angles defined by the following sets of atoms: H1C2H3 , 4 groups of charge aound C2, hence, ca. 109.5 O4C5C6 , 3 groups of charge around C5, hence, ca. 120 C7N8C9, three groups of charge around N8, hence, ca. 120 Give the hybridization of the following atoms: C2 , sp3 C5 , sp2 N8, sp2 The molecule is very flat. All the heavy (non-hydrogen) atoms in caffeine lie in the same plane. Provide an explanation fo All heavy atoms in the ring and the 2 oxygens can or are sp2 hybridized. The 2pz orbitals on these atoms which are adja Excluding the diatomic molecules X2 (X = C, Si, Ge, Sn, and Pb) which require special treatment, are quadruple bond poss...
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