Chapter 15, Problem 15.53AP

Interpretation Introduction

Interpretation:

The reason as to how the color of $\beta$-carotene be affected by treatment with a large excess of ${\text{H}}_{\text{2}}$ over a $\text{Pt}/\text{C}$ catalyst is to be explained.

Concept introduction:

The addition of ${\text{H}}_{\text{2}}$ in presence of a catalyst is known as catalytic hydrogenation reaction. This is a syn addition. The alkene is reduced to an alkane. In this reaction, the weak $\pi$ bond of alkene and sigma bond between ${\text{H}}_{\text{2}}$ is broken and two $\text{C}-\text{H}$ bonds are formed.