When the prefix cyclo- comes before the name of a hydrocarbon, what does it mean?

1 Answer
Feb 19, 2017

It means the beginning and the end of the alkane-chain are connected.


Cyclo-propane forms a triangle:

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Cyclo-pentane does something similar:
enter image source here

I think you get the idea from here.

Note :
Because of the 'ends' connecting, the cyclo-alkanes are of the form #C_nH_(2n)# in stead of #C_nH_(2n+2)#, and thus isomeres of the mono-alkenes.