I am doing problems on finding structural isomers. I am asked to find the structural isomers of $\ce{C5H10}$. The answer to problem states there are 10 structural isomers possible. I was able to find only 9. Could any one please tell what is the 10th isomer which I missed. Further could any one please tell is there any other method to find structural isomers other than to list them out, like a standard formula?

Structural isomers with C5H10 formula

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    $\begingroup$ Ethylcyclopropane is missing. $\endgroup$ – Ivan Neretin Aug 7 at 5:24

Ethylcyclopropane is missing.

Using the comment from Ivan Neretin.


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