Explanations:
What is isomerism?
Isomerism is defined as the existence of compounds that have the same molecular formula but different structural formulas.
According to the question, we are to illustrate the isomers of but-1-ene that show different forms of isomerization. But-1-ene is known to have C₄H₈ six different isomers. The structural formula of these isomers are illustrated below:
The other two are expressed as:
The structural formula of the but-1-ene itself is as illustrated below;