Draw all possible constitutional and stereoisomers for a compound of molecular formula${\mathbf{\text{C}}}_{\mathbf{6}}{\mathbf{\text{H}}}_{\mathbf{12}}$ having a cyclobutane ring and two methyl groups as substituents. Label each compound as chiral or achiral.

Another name that is utilized to denote constitutional isomers is “structural isomers”. A particular kind of constitutional isomer is a functional isomer.

Stereoisomers can be designated another name which is noted as “spatial isomers”. Enantiomers belong to the category of stereoisomers.

There are three constitutional isomers for the compound ${\text{C}}_6{\text{H}}_{12}$possessing a cyclobutane ring and two methyl groups. The constitutional isomers are given below:

Constitutional isomers

Structure A has a plane of symmetry and will be optically inactive. Hence, structure A is achiral. The plane of symmetry in compound A can be given as follows:

Plane of symmetry in compound A

The structure B contains a plane of symmetry and is optically inactive. Hence, structure B is achiral.

Plane of symmetry in compound B

The structure C does not contain a plane of symmetry and is optically active. Hence, structure C is chiral.

There are four stereoisomers for the compound with a formula ${\text{C}}_6{\text{H}}_{12}$comprising a cyclobutane ring and two methyl groups. The stereoisomers can be given as follows:

Stereoisomers

The structure D possesses a plane of symmetry and is optically inactive. Hence, compound D is achiral.

Plane of symmetry in compound D

The structure E does not possess a plane of symmetry and is optically active. Hence, compound E is chiral.

The structure F has a plane of symmetry and is optically inactive. Hence, compound E is achiral.

Plane of symmetry in compound F

The structure G does not comprise a chiral carbon as four varied functional groups are not linked to the carbon atom. Hence this compound is achiral.