Question: 21. Using structural formulas, explain the following observations: a) cis-1.2-dimethylcyclopropane has a higher heat of combustion than trans-1.2-dimethylcyclopropane. (6 marks) b) the boiling point of

21. Using structural formulas, explain the following observations: a) cis-1.2-dimethylcyclopropane has a higher heat of combustion than trans-1.2-dimethylcyclopropane. (6 marks) b) the boiling point of CH3CH2CH2NH2 is 49 "C while the boiling point of (CH3)3N is 3 .C. (6 marks)22. Draw Newman projections for the anti, gauche and syn-eclipsed conformations of 2.3-dimethylbutane about the C2-C3 bond axis, and label them as most stable, second most stable and least stable. (9 marks) 23. Give TUPAC names for the following compounds. Provide E/Z or R/S designation where appropriate. (6 marks) O C BF OCH2 CH3 CH324. Identify the type of hybridization of the atoms marked by an arrow. (5 marks) page 7 of 9 HaC-C=C-CH,-N-H O O O H 25. Draw a structural formula for 2-chloro-3-hexyn-1-ol

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