Chapter 9, Problem 9E.6P

Interpretation Introduction

Interpretation:

The changes in the bond order that occur with the ${\text{π}}^{\ast }\leftarrow \text{π}$ ultraviolet absorptions in butadiene and benzene have to be stated.

Concept introduction:

Electronic configuration tells about the arrangement of the electrons in each subshell and each orbit of an atom.  The distribution of the electrons in the molecules is described by the molecular orbital theory.  The bond order of a molecule $\left(b\right)$ is given by the expression as shown below.

  $b=\frac{N-N^{*}}{2}$