The molecule 2-butene, C4 H8, can undergo a geometric change called cis-trans isomerization: As discussed in the "Chemistry and Life" box on the chemistry of vision, such transformations can be induced by light and are the key to human vision.
The isomerization occurs by rotation about the central C-C bond. With reference to Figure9.32 in the textbook, explain why the bond between the two central carbon atoms is destroyed halfway through the rotation from cis - to trans-2-butene.
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