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Home Q & A Board Science-Related Homework Help Chemistry (Moderator: Laser_3)
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Byrondavis Byrondavis
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6 years ago

 

 

  Measure the CH3, CH3 distance in the energy-minimized model of cis-2-butene, and the CH3, H distance in the energy-minimized model of trans-2-butene. In which isomer is the nonbonded interaction strain greater?
 
 

 

 
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6 years ago



For cis-2-butene, the distance between the hydrogen atoms on adjacent methyl groups varies as the methyl group rotates, but is 2.1 A in the energy minimized structure. For trans-2-butene, the distance between the hydrogen atoms of the methyl group and the alkene hydrogen atom also varies as the methyl group rotates, with a value of 2.4 A in the energy minimized structure. Clearly, there is greater nonbonded interaction strain in cis-2-butene.


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