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15. Two important industrial chemicals, ethene, CiH, and propene, CH, are produced by the steam (or thermal) cracking process 20,16.08) ,H1,(8) + C,H.(8) + CH,(8) + H,(8) The Lewis structure for propene is shown on the right The geometry and hybridization of carbons 1, 2 and 3 respectively is: A Ci tetrahedral, sp'; C2 trigonal planar, sp'; c3 tetrahedral, sp B. Ci trigonal planar, sp'; C2 trigonal planar, sp'; c3 tetrahedral, sp C C trigonal planar, sp': C2 tetrahedral, sp'; C3 tetrahedral, sp D. Ci bent, sp;C2 bent, sp', c3 tetrahedral, sp are 16. Consider the molecule allene H.C=C-CH). How many sigma bond and pi bonds respectively there in allene? A. 4 sigma and 3 pl B. 6 sigma and 3 pi C. 6 sigma and 2 pi D. 5 sigma and 3 pl 17. The molecular orbital electron configuration of a particular diatomic species is (02)'0*2.)*((2p)"(Tt2p)*(*t*2p)? What is the bond order for this species? A 3.5 8.3 C 2.5 D. 2 E 1.5 18. Consider the following Lewis structure: H OHH Which statement about the molecule is false? 1-6--=- 1 ) ) A. There are 10 sigma and 2 pi bonds. B. C-2 is sp hybridized with bond angles of 120°. C. Oxygen is sphybridized. D. This molecule contains 28 valence electrons. E. There are some H-C-H bond angles of about 109° in this molecule. 19. The fact that O, is paramagnetic can be explained by A. the Lewis structure of Oz B. resonance C. a violation of the octet rule D. the molecular orbital diagram for 0, E. hybridization of atomic orbitals of Oz and the bond length 20. As the bond order of a bond increases, the bond energy. A. Increases, increases B. decreases, decreases C. increases, decreases D. decreases, increases E. More information is needed to answer this question.