Answer
424.2k+ views
Hint: ${{C}_{6}}{{H}_{12}}$ means there are 6 carbon atoms present. Carbocyclic means that there is a ring present in the molecule. The rings can be of 3-ring, 4-ring, 5-ring, and 6-ring structures.
Complete answer:
So let us see the isomers one by one:
(a)- Cyclohexane
It is a ring structure of six carbon atoms as the name suggests. All the carbon has 2 hydrogens each. The structure is given below:
(b)- 1-Methyl cyclopentane
It is a ring structure of five carbon atoms and one methyl group is attached to the carbon atom of the ring. The structure is given below:
(c)- 1-Ethyl cyclobutane
It is a ring structure of four carbon atoms and one ethyl group is attached to the carbon atom of the ring. The structure is given below:
(d)- 1-n-propyl cyclopropane
It is a ring structure of three carbon atoms and at one of the carbon, a straight three carbon chain is present. The structure is given below:
(e)- 1-isopropyl cyclopropane
It is a ring structure of three carbon atoms and at one of the carbon a straight chain of three carbon is present and the carbon of the ring is attached to the second carbon of the chain. The structure is given below:
(f)- 1,2-Dimethyl cyclobutane
It is a ring structure of four carbon atoms and 2 methyl groups are present at the adjacent carbon atom of the ring. The structure is given below:
(g)- 1,3-Dimethyl cyclobutane
It is a ring structure of four carbon atoms and 2 methyl groups are present at the opposite carbon atom of the ring. The structure is given below:
So, the correct answer is “Option A”.
Note: There are more isomers of hexane like 1,1-Dimethyl cyclobutane, 1-ethyl-2-methyl cyclopropane, 1-ethyl-1-methyl cyclopropane, 1,2,3-trimethyl cyclopropane, etc. There are more isomers of hexane like 1,1-Dimethyl cyclobutane, 1-ethyl-2-methyl cyclopropane, 1-ethyl-1-methyl cyclopropane, 1,2,3-trimethyl cyclopropane, etc. But these are not structural isomers having at least one carbocyclic ring . Thus they are not counted here.
Complete answer:
So let us see the isomers one by one:
(a)- Cyclohexane
It is a ring structure of six carbon atoms as the name suggests. All the carbon has 2 hydrogens each. The structure is given below:
![seo images](https://www.vedantu.com/question-sets/581c2ce4-ae0d-4c8c-8eff-2874ad4a133d4507444361044473627.png)
(b)- 1-Methyl cyclopentane
It is a ring structure of five carbon atoms and one methyl group is attached to the carbon atom of the ring. The structure is given below:
![seo images](https://www.vedantu.com/question-sets/aa34e410-f9e4-4f45-aed9-4fae41124b562168253158380142703.png)
(c)- 1-Ethyl cyclobutane
It is a ring structure of four carbon atoms and one ethyl group is attached to the carbon atom of the ring. The structure is given below:
![seo images](https://www.vedantu.com/question-sets/8c51fafd-3948-4c5d-b140-61adead7688c8010523335715566969.png)
(d)- 1-n-propyl cyclopropane
It is a ring structure of three carbon atoms and at one of the carbon, a straight three carbon chain is present. The structure is given below:
![seo images](https://www.vedantu.com/question-sets/1b325fcd-a5a1-4986-87d6-bd0ccd79297d6159206375956911409.png)
(e)- 1-isopropyl cyclopropane
It is a ring structure of three carbon atoms and at one of the carbon a straight chain of three carbon is present and the carbon of the ring is attached to the second carbon of the chain. The structure is given below:
![seo images](https://www.vedantu.com/question-sets/9c7df77c-25e5-4d22-9e23-0231563056d12392621308653464362.png)
(f)- 1,2-Dimethyl cyclobutane
It is a ring structure of four carbon atoms and 2 methyl groups are present at the adjacent carbon atom of the ring. The structure is given below:
![seo images](https://www.vedantu.com/question-sets/7df0281b-6eb3-4bfb-ab93-3b79f7277b3d8551428390391904399.png)
(g)- 1,3-Dimethyl cyclobutane
It is a ring structure of four carbon atoms and 2 methyl groups are present at the opposite carbon atom of the ring. The structure is given below:
![seo images](https://www.vedantu.com/question-sets/1b7d7974-bbf6-41f3-9566-72e74c0e05183786392789211483626.png)
So, the correct answer is “Option A”.
Note: There are more isomers of hexane like 1,1-Dimethyl cyclobutane, 1-ethyl-2-methyl cyclopropane, 1-ethyl-1-methyl cyclopropane, 1,2,3-trimethyl cyclopropane, etc. There are more isomers of hexane like 1,1-Dimethyl cyclobutane, 1-ethyl-2-methyl cyclopropane, 1-ethyl-1-methyl cyclopropane, 1,2,3-trimethyl cyclopropane, etc. But these are not structural isomers having at least one carbocyclic ring . Thus they are not counted here.
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