A Study Community for Everyone and Everything. We have weekly sessions on Spirituality, Math and Science! JEE, NEET prep? All doubts are crowdsourced. Hare Krishna!
The reason why something exists or does not exist usually has to do with thermodynamics or kinetics. So it must be one of those things. In this case, if XCF 7 is there, then it will break down and give you something else like XCF 6 and XCF 4 or something like that. These are hypothetical things, see online.