Chemistry - GOC Question with Solution | TestHub

Due to resonance in 1,3-butadiene (CH₂=CH-CH=CH₂), the $\pi$ electrons are delocalized across all four carbon atoms. This delocalization gives the single bond (C₂-C₃) partial double-bond character, making it shorter than a standard single bond. Conversely, the double bonds (C₁-C₂ and C₃-C₄) acquire partial single-bond character, making them longer than a standard double bond.

Answer: The correct statements are (a), (c), and (d).