3.19All the staggered conformations about the C-2GC-3 bond of 2,2-dimethylpropane are equivalent toone another and of equal energy; they represent potential energy minima. All the eclipsed confor-mations are equivalent and represent potential energy maxima.The shape of the potential energy profle for internal rotation in 2,2-dimethylpropane moreclosely resembles that of ethane than that of butane.3.20The potential energy diagram of 2-methylbutane more closely resembles that of butane than that ofpropane in that the three staggered forms are not all of the same energy. Similarly, not all of the
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