The total number of possible isomers with molecular formula C6H12 that contain a cyclobutane ring

Explanation:

To find the total number of possible isomers with the molecular formula C6H12 that contain a cyclobutane ring, we need to consider the different ways in which the carbon atoms can be arranged to form a cyclobutane ring.

Step 1: Draw the cyclobutane ring

Start by drawing a cyclobutane ring, which consists of four carbon atoms arranged in a ring.

Step 2: Add the remaining hydrogen atoms

Each carbon atom in the cyclobutane ring must be bonded to one hydrogen atom. Therefore, add hydrogen atoms to each carbon atom in the ring.

Step 3: Consider the possible positions of the remaining carbon atoms

Since the molecular formula is C6H12, there are two additional carbon atoms that need to be placed in the structure. These carbon atoms can be added in different positions within the ring or outside the ring.

Step 4: Count the possible isomers

To count the possible isomers, we need to consider the different ways in which the two additional carbon atoms can be placed in the structure.

Possible isomers:
1. The two additional carbon atoms can be added to the same carbon atom in the cyclobutane ring. This results in a structure with a bridged cyclobutane ring.

2. The two additional carbon atoms can be added to adjacent carbon atoms in the cyclobutane ring. This results in a structure with a fused cyclobutane ring.

3. The two additional carbon atoms can be added to non-adjacent carbon atoms in the cyclobutane ring. This results in a structure with a spirocyclobutane ring.

4. One additional carbon atom can be added to the cyclobutane ring, while the other carbon atom is placed outside the ring. This results in a structure with a cyclobutane ring and a methyl group.

5. One additional carbon atom can be added to the cyclobutane ring, while the other carbon atom is placed outside the ring. This results in a structure with a cyclobutane ring and an ethyl group.

6. Both additional carbon atoms can be placed outside the cyclobutane ring. This results in a structure with a cyclobutane ring and two methyl groups.

7. Both additional carbon atoms can be placed outside the cyclobutane ring. This results in a structure with a cyclobutane ring and one methyl group and one ethyl group.

Therefore, the correct answer is '7', as there are seven possible isomers with the molecular formula C6H12 that contain a cyclobutane ring.