Question

In the following molecule, the $C_2-C_3$ bond length is shorter than the usual $C-C$ bond length. The reason for this observation is ______
$C=\underset{\left(2\right)}{C}-\underset{\left(3\right)}{C}=C$

• A. Odd electrons
• B. Incomplete octet
• C. Resonance
• D. Extented Octet

Answer 1

The correct option is C

Resonance

The given molecule has a resonance structure because of the alternate double bonds.

Thus there is some double bond character present in $C_2-C_3$, which makes it shorter.