# Isomers of CycloHexane

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1. Oct 21, 2014

### phoenixXL

Question
Find out the total number of possible isomers with molecular formula C6H12 that contain a cyclobutane ring.

Attempted Solution

In Compound 3, Optical Isomerism is possible (geometrical isomerism is also possible but is neglected due to presence of optical isomerism) about both the branches, hence it will be counted as 4 isomers

In Compound 4, Geometrical Isomerism is possible about the two branches, therefore it will be counted as 2 isomers

Counting All
: 1 + 1 + 4 + 2 = 8

Hence there are 8 isomers possible

Problem
The book where I found this question says that it consists only of 7 isomers.

2. Oct 21, 2014

### Staff: Mentor

Check 3rd.

3. Oct 21, 2014

### phoenixXL

Yes, I was suspecting the argument with compound 3.

Compound 3 will have cis & trans forms. The cis form due to symmetry would not have optical isomers whereas the trans form would have optical isomers. As a result there would be three isomers (rather than 4).

4. Oct 21, 2014

### Staff: Mentor

Yes, 3 not 4.

5. Oct 22, 2014

### phoenixXL

thank you for your time :)