  The second part of this paper is devoted to the following important question
in organic chemistry: given two isomers of a molecule, how to identify them
with their structural formulae using only type properties of that molecule? A
classical answer of this question is given for benzene by the identification of
its di-substituted (para, ortho, and meta), and tri-substituted (asymmetric,
vicinal, and symmetric) derivatives via the Korner substitution reactions among
them. Here we develop a machinery within the framework of the Lunn-Senior's
mathematical model of isomerism in organic chemistry, which, in principle,
answers this question. In particular, it is shown that the members of a chiral
pair cannot be distinguished via substitution reactions. The examples of
ethene, benzene, and cyclopropane are discussed.
