Chapter 11, Problem 58IAE

Pyridine, ${\text{C}}_{\text{2}}{\text{H}}_{\text{2}}\text{N}$ , is used in the synthesis of vitamins and drugs. The molecule can be thought of in terms of replacing one CH unit in benzene with a N atom. Draw orbital diagrams to show the orbitals of the C and N atoms involved in the $\sigma$ and $\pi$ bonding in pyridine. How many bonding and antibonding $\pi$ -type molecular orbitals are present' How many delocalized electrons are present?