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if any two compounds happen to show tautomerism, ring chain isomerism, functional isomerism, metamerism, chain isomerism as well as position isomerism, what priority order do we follow to assign them a single type of structural isomerism.

in one of the resources I got the order:

ring chain > tautomerism > functional isomerism > metamerism > chain isomerism > positional isomerism

whereas at other I got :

tautomerism > ring chain > functional isomerism > metamerism > chain isomerism > positional isomerism

so I am confused now to which order I should follow and is there any logic behind these orders?

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  • $\begingroup$ "is there any logic?" doesn't seem like it $\endgroup$ – orthocresol Sep 3 '19 at 11:27
  • $\begingroup$ I thought the same. $\endgroup$ – Garima Singh Sep 3 '19 at 11:34
  • $\begingroup$ what about the order which one is correct? $\endgroup$ – Garima Singh Sep 3 '19 at 11:35
  • $\begingroup$ If there's no logic behind it, then there's no reason either should be correct. To be honest, I have never seen such a ranking of isomerism types before. It seems pretty pointless to me. If two things are tautomers, it doesn't suddenly stop them from also being other types of isomers. $\endgroup$ – orthocresol Sep 3 '19 at 11:38
  • $\begingroup$ With regards to metamerism: chemistry.stackexchange.com/q/117674/4945 There is no unambiguous definition; it's a deprecated term. For what it's worth, I think they are all constitutional isomers (doi.org/10.1351/goldbook.C01285), any ordering would be completely arbitrary and of no additional use. Don't make thing more complicated then they really have to be. $\endgroup$ – Martin - マーチン Sep 3 '19 at 12:16
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U see if a isomer is tauto or ring chain it does not stop being others As for others functional>meta >chain >position>stereo (actually these 5 five are defined in such a way, yeah 2 structures cannot be functional and chain simultaneously).actually this is how do these kind of problems, well i have not been wrong untill now according to my text that is.

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