question_answer

All bonds in benzene are equal due to [Roorkee 1990; KCET 1998]

A) Tautomerism

B) Inductive effect

C) Resonance

D) Isomerism

Correct Answer: C

Solution :

  All the bonds \[(C-C)\] are equal in benzene. The \[C-C\] bond length is \[1.39\text{{ }\!\!\mathrm{\AA}\!\!\text{ }}\] which is in between \[C-C\] bond \[\underset{\begin{matrix}    {}  \\    \begin{smallmatrix}  \text{1, 2, 3-Trimethyl} \\  \text{benzene} \end{smallmatrix}  \\ \end{matrix}}{\mathop{\begin{matrix}    C{{H}_{3}}  \\    {}  \\    {}  \\ \end{matrix}\,\,\,\,}}\,\] and \[C=C\] \[(1.34\text{{ }\!\!\mathrm{\AA}\!\!\text{ }})\].