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← ScienceWhich consequence results when increased sigma bond delocalization forms in butadiene?
A)Increased ultraviolet light absorption✓
B)Reduced chemical reactivity overall
C)Enhanced structural rigidity notably
D)Decreased torsional bond stiffness
💡 Explanation
Increased conjugation in butadiene lowers the energy gap between the HOMO and LUMO due to *molecular orbital theory*, because the electrons are spread across multiple carbon atoms; therefore, ultraviolet absorption increases, rather than reduced reactivity because of this delocalisation.
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