In which of the following compounds are all of the carbon atoms in the same plane?
42. Which of the following compounds can adopt a chair conformation in which there are no axial methyl groups?
43. Which of the following compounds can adopt a chair conformation in which there are no axial methyl groups?
44. Which of the following statements is not true regarding the conformation of substituted cyclohexanes?
A. ring inversion of cyclohexane between two chair conformations takes place via a boat conformation
B. substituted cyclohexanes are destabilized by 1,3-diaxial interactions
C. the boat conformation of cyclohexane is usually more stable than the chair conformation
D. the relative amount of two conformations of substituted cyclohexanes can be determined from the difference in strain energy
45. What is the approximate dihedral angle between the two chlorine atoms in cis-1,2-dichlorocyclohexane?
46. What is the approximate dihedral angle between the two chlorine atoms in the diequatorial conformation of trans-1,2-dichlorocyclohexane?
47. What is the approximate dihedral angle between the two chlorine atoms in the diaxial conformation of trans-1,2-dichlorocyclohexane?
48. Which of the following is not true regarding the properties of alkanes?
A. alkanes are nonpolar
B. alkanes burn in air to give H2O and CO2
C. alkanes are highly miscible with water
D. the strongest intermolecular force between alkane molecules is the van der Waals interaction
49. Which of the following undergoes the most exothermic combustion?
50. How many moles of molecular oxygen (O2) are consumed in the complete combustion of one mole of octane (C8H18)?
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