Which of the following is correct about the following compound

Options

A. All the `C-C` bond length are same
B. `C_(1)-C_(2)` bond length is shorter than `C_(2)-C_(3)` bond length
C. `C_(1)-C_(2)` bond length is greater than `C_(2)-C_(3)` bond length
D. All the `C-C` bond length are equal to `C-C` bond length of benzene

Answer

B

Explanation

`C^(1)-C^(2)-` is shorter because it is double bond in two of three resonance structure, `C_(2)-C_(3)` is a single bond in two of three resonance structures.