I was wondering if there exists a compound, the molecular formula for which includes CH but does not include any numbers.

Like CHClF2 but without 2 :)

(I've scanned the Wikipedia data source linked from PubChem but there doesn't seem to be a match).

If not, is there perhaps an explanation why such compound cannot exist?

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    $\begingroup$ How about CHFClBr? Or CHOCl? $\endgroup$ – Ed V Aug 9 '19 at 1:24
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    $\begingroup$ It is rather funny that HCN did not show up in your search. $\endgroup$ – Ed V Aug 9 '19 at 2:43
  • $\begingroup$ I specifically wanted CH in that order. The reason for that is beyond the scope, but it's to do with how we read formulae out loud. $\endgroup$ – Dima Tisnek Aug 9 '19 at 4:13
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    $\begingroup$ In a molecular formula, the order in which you put the elements is entirely arbitrary. Sometimes people try to be as faithful as possible to the connectivity. Sometimes people put C, H, and O in front, and then everything else behind it in alphabetical order. But nobody says you have to do any of these. The request for a specific order, therefore, doesn't make sense unless you have a certain constraint on the way you want to write your molecular formula. $\endgroup$ – orthocresol Aug 9 '19 at 19:22
  • $\begingroup$ Thank you, closers, actually this was not homework. It was about reading compound formulae in some natural languages. Totally OK to close and delete though. $\endgroup$ – Dima Tisnek Aug 18 '19 at 10:39

CHFClBr, CHClBrI are examples. You can substitute hydrogen atoms with halogen atoms by radical halogenation reactions.

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  • $\begingroup$ Your first one is the same one I put in my comment! $\endgroup$ – Ed V Aug 9 '19 at 2:02
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    $\begingroup$ It's CHBrClF - substituents are supposed to be in order. Not to say that there's lots of other and less obscure options then chiral trihalomethanes. $\endgroup$ – Mithoron Aug 9 '19 at 17:56

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