Q.26. - Organic Chemistry

Question

Question: For cis-1,3-diethylcyclobutane, draw (a) a stereoisomer; (b) a constitutional isomer.

Step-by-Step Solution

Answer

Answer

a. trans-1,3-diethylcyclobutane

b. Cis-1,2-diethylcyclobutane

Step 1: Definition of a stereoisomer

Stereoisomers are compounds with the same molecular formula but differ from each other only in terms of the three-dimensional arrangement of the atoms or groups attached to them. 

The cis and trans isomers are examples of stereoisomers. 

• In the case of a cis isomer, both functional groups are present on the same side of the molecule. 
• In the case of a trans isomer, both functional groups are on different sides of the molecule.

Step 2: Definition of a constitutional isomer

These are isomers that have the same molecular formula but different structures. In these isomers, the position of the functional groups may be different in different isomers. 

Step3: The stereoisomers and the constitutional isomers of cis-1,3-diethylcyclobutane

Cis-1,3-diethylcyclobutane has the following structure:

Cis-1,3-diethylcyclobutane

 

(a) Trans-1,3-diethylcyclobutane is the stereoisomer of cis-1,3-diethylcyclobutane. It has the following structure:

Trans-1,3-diethylcyclobutane

 

(b) Cis-1,2-diethylcyclobutane is the constitutional isomer of cis-1,3-diethylcyclobutane. It has the following structure:

Cis-1,2-diethylcyclobutane