Chapter 1.10, Problem 20CC

Interpretation Introduction

Interpretation: The reason for free rotation of sigma bonds in contrast to no rotation in pi bonds at room temperature needs to be explained.

Concept Introduction: $\text{σ}$ and $\text{π}$ bonds are type of covalent bonds that are formed by the overlapping of the atomic orbitals. The difference between two is that head-to-head overlapping of atomic orbitals results in $\text{σ}$ bond formation whereas lateral overlapping of atomic orbitals results in $\text{π}$ bond formation.