Chemistry - GOC Question with Solution | TestHub

Draw the three Kekulé structures. ${\mathrm{C}}_1-{\mathrm{C}}_2$ is double in 2 of the 3 structures (bond order 1.67), ${\mathrm{C}}_2-{\mathrm{C}}_3$ is double in only 1 (1.33), ${\mathrm{C}}_1-C8a$ is double in 1 (1.33) and C4a-C8a is double in 1 (1.33).

The bond with the highest double-bond character is the shortest : ${\mathrm{C}}_1-{\mathrm{C}}_2$.