Organic Chemistry 1 Quiz
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STRUCTURE, BONDING & REACTIVITY FOUNDATIONS
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Which statement provides the most accurate explanation for why cis-trans isomerism is possible for 2-butene but not for butane?
A
The sp³-sp³ sigma bond in butane is much stronger than the sp²-sp² sigma bond in 2-butene, preventing any rotation.
B
Rotation around the C=C double bond in 2-butene would require breaking the pi bond, which is energetically costly, while rotation around C-C single bonds in butane is facile.
C
The hydrogen atoms in 2-butene are held more rigidly by sp² orbitals, whereas the sp³ orbitals in butane allow the hydrogens more freedom of movement.
D
Butane is a nonpolar molecule, allowing free rotation, while 2-butene has a dipole moment that locks the molecule into a specific conformation.
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