Question

Which of the following compounds show $C-C$ bond length in between those single and double bond?

• A. |,||
• B. |,||,|V
• C. |,||,|||
• D. |,|V

Answer 1

The correct option is A |,||

The $C-C$ bond length in between the single and double bonds is due to resonance.

Resonance is shown by planar structures and having adjacent single and double bonds.

Therefore, $\left(I\right)$ and $\left(II\right)$ compounds shows $C-C$ bond length in between single and double bonds.