Chapter 15, Problem 15.47E

Interpretation Introduction

Interpretation:

The change caused by substitution of hydrogen atoms by deuterium atoms in Hückel approximation of ethylene molecule is to be explained.

Concept introduction:

Hückel theory deals with the conjugated systems. In this theory, the $\pi$ and $\sigma$ bonds are treated separately. It states that the $\sigma$ bonds form the overall structure of the molecule and the $\pi$ bonds spread out over the carbon atoms. In Hückel approximation, the $\pi$ orbitals are assumed to be the combination of the atomic orbitals of the carbon atoms which are involved in conjugation of $\pi$ bonds.