Why Is There an Energetic Barrier to Rotation of the C=C

question 21

Multiple Choice

Why is there an energetic barrier to rotation of the C=C bond in ethene?

• A) The trans isomer is more stable than the cis isomer.
• B) Rotation breaks the s C-C bond.
• C) Rotation breaks the p C-C bond.
• D) Steric repulsion between the hydrogen atoms.
• E) There is no energy barrier to rotation of this bond.

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