Replacing atom in Hydrocarbon Molecule [closed]








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I am working with Hydrocarbons. In some of me analysis I see that carbon atoms are replaced with oxygen or other elements, like this one [![enter image description here](https://i.stack.imgur.com/QHKYV.png)](https://i.stack.imgur.com/QHKYV.png).
Me question is: is only the carbon atom can be replaced or the hydrogen can be also be replaced?
Thanks! 




Hydrogen atoms can be replaced with other atoms with a valence of one, like Chlorine and other halogens. This gives a family of substances called [haloalkanes](https://en.m.wikipedia.org/wiki/Haloalkane).


Another option is a group of atoms like -OH: this gives [alcohol](https://en.m.wikipedia.org/wiki/Alcohol).


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