What Are Heterocyclic Compounds

Multiple Choice

What are heterocyclic compounds?

A) They are cyclic compounds in which carbon has one or more substituents that are neither hydrogen or another carbon atom.
B) They are cyclic compounds in which two or more carbon rings are connected by C-C bonds (for example biphenyl) .
C) They are cyclic compounds in which carbon ring is connected to another ring not containing carbon atoms.
D) They are cyclic compounds in which one or more atoms are not carbon atoms.
E) They are cyclic compounds that can have more than one stable conformation.