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As per your syllabus, rotation about a C=C double bond in ethene (H₂C=CH₂) is best described as which?
ARandom
BRestricted
CFaster than C-C
DFree
Answer & Solution
Correct answer: B. Restricted
Your syllabus: π bond requires parallel p-orbital overlap
rotating one CH₂ would break the π bond, so rotation is restricted.
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