Chapter 16, Problem 31PP

Interpretation Introduction

Interpretation:

The given compounds having conjugated π system should be circled.

Concept introduction:

The compounds having two $\text{C}\text{=}\text{C}$ π bonds or $\text{C}\text{=}\text{C}$ bond with $\text{C}\text{=}\text{O}$ bonds are called dienes.

Based on the proximity of $\text{C}\text{=}\text{C}$ bonds in dienes, they are called conjugated dienes if the $\text{C}\text{=}\text{C}$ bonds or $\text{C}\text{=}\text{C}$ and $\text{C}\text{=}\text{O}$ are separated by one σ-bond.

To draw: the given compounds having conjugated π system.