Chapter 15, Problem 15.3P

Interpretation Introduction

Interpretation:

$s-\text{cis}$ and $s-\text{trans}$ conformations of $\left(2E,4Z\right)\text{-}2,4\text{-hexadiene}$ and $\left(2E,4E\right)\text{-}2,4\text{-hexadiene}$ are to be drawn. The diene with greater proportion of gauche conformation is to be stated.

Concept introduction:

In $s-\text{trans}$ conformation, the two double bonds are present opposite to each other that mean the double bonds are trans to each other in the conformation.

In $s-\text{cis}$ conformation, the two double bonds are present on the same side that means the double bonds are cis in the conformation. The stability of $s-\text{cis}$ and $s-\text{trans}$ conformation depends on Vander Waals repulsion.