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17) What is the Ideal angle between the HCH bond in methane? 17) A) 180 B) 90 C) 109.5 D) 120 E) none of the above 18) When an alkene undergoes hydrogenation, the product is an A) aromatic. B) alkene. C) alkane. D) alcohol. E) alkyne. 18) 19) When an alkene undergoes a hydration reaction the product is an A) alkyne. B) alcohol. C) aromatic. D) alkane. E) ether. 19) 20) Which reactant should be used to convert propene to 2-chloropropane? A) NaCl B) HCl C) H2 D) BrCl E) Cl2 20) 21) When 2 -butene reacts completely with bromine, the product is 21) A) 1,3-dibromobutane. B) 2-bromobutane. C) 1,2-dibromobutane. D) 2,3-dibromobutane. E) 3-bromobutane. 22) Markovnikov's Rule refers to A) The color of a molecule containing multiple double bonds. 22) B) The rate of hydrogen addition to an alkene with alkyl group substituents. C) The temperature difference observed in the boiling points of cis and trans alkenes. D) The orlentation an unsymmetrical reagent will take when added to an unsymmetrical alkene. E) The ideal bond angle between substituents on a double bond. 23) The concept that explains the properties of aromatic compounds based on a structure that is an 23) average among two possible structures is A) oxidation. B) polymerization. C) cis-transi isomerism. D) double bonding. E) resonance