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The molecule 2-butene, C4H8, can undergo a geometric change called cis-trans isomerization. (Figure 1) Such transformations can be induced by light and are the key to human vision. Rotation about the C=C bond, which breaks the π bond, is required for the isomerization. What is the hybridization at the two central carbon atoms of 2-butene? a) sp b) sp^2 c) sp^3 d) sp^3d e) sp^3d^2