Chapter 21, Problem 42E

Interpretation Introduction

Interpretation:

Whether the cis-trans isomers possible for ${\text{CH}}_{\text{3}}{\text{CH}}_{\text{2}}{\text{CH=CHCH}}_{\text{2}}{\text{CH}}_{\text{3}}$ or not is to be determined. If isomers are possible then the IUPAC name of the isomers is to be determined if not then IUPAC name of the compound is to be named.

Concept introduction:

The structural formula of a compound represents the molecular structure along with the atom connectivity and bonding arrangement.

Alkene contains a double bond between two carbons atoms whereas alkynes have a triple bond. Alkenes the general formula is ${\text{C}}_n{\text{H}}_{2n}$, while the alkyne general formula is ${\text{C}}_n{\text{H}}_{2n-2}$.

Due to the presence of a double bond, the rotation about adjacent carbon-carbon atoms is highly restricted. Hence, alkenes can exist in two forms which have the similar molecular formula but different types of arrangement of atoms around the double bond. This isomerism is a type of stereoisomerism which is known as geometric isomerism or cis-trans isomerism, for example, 1, 2-dichloroethane can show the geometrical isomerism,