Question

What are the general reactions of the heterocyclic compounds?

Answer 1

Aromatic heterocycles normally undergo `"aromatic heterocyclic substitution."`

Explanation:

And whole text books have been written about their reactivity, and you are going to have to consult your text.

`"Pyrrole,"` `C_5H_4NH`; `"furan,"` `C_5H_4NO`; and `"thiophen,"` `C_5H_4S`, are so-called `pi-"excessive"` aromatic heterocycles because the lone-pairs on the heteroatom is delocalized around the ring, making these species MUCH more nucleophilic than the benzene system.