'Which of the following statements is not true regarding the conformation of substituted cyclohexanes?
the boat conformation of cyclohexane is usually more stable than the chair conformation
the relative amount of two conformations of substituted cyclohexanes can be determined from the difference in strain energy
ring inversion of cyclohexane between two chair conformations takes place via a boat conformation
substituted cyclohexanes are destabilized by 1,3-diaxial interactions'