IMAT 2013 - Organic isomers


I came across this question in the IMAT 2013, but I am not sure why is the correct answer E. I know there are 2 types of isomerism: structural and optical. The optical isomers (enantiomers) have the same structural formula, so why is it correct to say organic isomers have different structural formulae? Or does it only ask about “some” isomers (structural) which have different structural formulae?

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I suppose what they mean by organic isomers are isomers in general as we know that in structural isomerism we have the same molecular formula but different structures.
Even enantiomers are a pair of molecules that exist in two forms that are non-superimposed mirror images of each other so, they basically exist in two different forms with the same formula.
Hope it helps.



Constitutional : all bondings are different
Stereoisomers : some bondings are similar
conformational : do those similar bondings have single bonded if yes it is conformational
configurational : do those similar bondings have double bonded or the isomers cannot be interconverted without breaking a covalent bond if yes it is configurational
geometric : cis - trans or e - z notations
optical : shows some optical activity

This is I learned so far, I hope I am not misleading with any wrong information If you believe so please leave a comment with proper info

Kind regards